A 67-year-old female patient is brought to the emergency department after her daughter noticed she has been having meaningless speech. When assessing the patient, she calls the chair a table, and at times would make up new words. She does not appear to be aware of her deficit, and is carrying on an empty conversation. Her speech is fluent, but with paraphasic errors. Her repetition is impaired. On physical examination, a right upper quadrant field-cut is appreciated, with impairment in comprehension and repetition. Which of the following structures is most likely involved in this patient’s presentation?
Q2
A 40-year-old man is brought to the emergency department after sustaining multiple lacerations during a bar fight. The patient’s wife says that he has been showing worsening aggression and has been involved in a lot of arguments and fights for the past 2 years. The patient has no significant past medical or psychiatric history and currently takes no medications. The patient cannot provide any relevant family history since he was adopted as an infant. His vitals are within normal limits. On physical examination, the patient looks apathetic and grimaces repeatedly. Suddenly, his arms start to swing by his side in an uncontrolled manner. Which area of the brain is most likely affected in this patient?
Q3
In a patient with acute myocardial ischemia, which of the following cardiovascular structures is at greatest risk of damage?
Q4
A 57-year-old man is brought to the physician for worsening mental status over the past 2 months. His wife reports he was initially experiencing lapses in memory and over the past 3 weeks he has begun having difficulties performing activities of daily living. Yesterday, he became lost heading to the post office down the street. He has hypertension treated with lisinopril and hydrochlorothiazide. Vital signs are within normal limits. He is alert but verbally uncommunicative. Muscle strength is normal. Reflexes are 2+ in bilateral upper and lower extremities. He has diffuse involuntary muscle jerking that can be provoked by loud noises. Mental status examination shows a blunt affect. A complete blood count and serum concentrations of glucose, creatinine, and electrolytes are within the reference range. Which of the following is the most likely diagnosis?
Q5
An 82-year-old right-handed woman is brought in by ambulance after being found down in her home. On presentation, she is found to be awake but does not follow directions or respond to questions. She is able to speak and produces a fluent string of nonsensical words and sounds. She does not appear to be bothered by her deficits. Subsequent neurologic exam finds that the patient is unable to comprehend any instructions and is also unable to repeat phrases. CT scan reveals an acute stroke to her left hemisphere. Damage to which of the following structures would be most likely to result in this pattern of deficits?
Q6
Arrange in sequence the structures involved in the direct pathway (1=Striatum, 2=GPi, 3=Thalamus, 4=Cortex output, 5=Cortex input):-
Q7
A 68-year-old man is brought to the emergency department by ambulance after he was found to be altered at home. Specifically, his wife says that he fell and was unable to get back up while walking to bed. When she approached him, she found that he was unable to move his left leg. His past medical history is significant for hypertension, atrial fibrillation, and diabetes. In addition, he has a 20-pack-year smoking history. On presentation, he is found to still have difficulty moving his left leg though motor function in his left arm is completely intact. The cause of this patient's symptoms most likely occurred in an artery supplying which of the following brain regions?
Q8
A 65-year-old man is referred by his primary care provider to a neurologist for leg pain. He reports a 6-month history of progressive bilateral lower extremity pain that is worse in his left leg. The pain is 5/10 in severity at its worst and is described as a "burning" pain. He has noticed that the pain is acutely worse when he walks downhill. He has started riding his stationary bike more often as it relieves his pain. His past medical history is notable for hypertension, diabetes mellitus, and a prior myocardial infarction. He also sustained a distal radius fracture the previous year after falling on his outstretched hand. He takes aspirin, atorvastatin, metformin, glyburide, enalapril, and metoprolol. He has a 30-pack-year smoking history and drinks 2-3 glasses of wine with dinner every night. His temperature is 99°F (37.2°C), blood pressure is 145/85 mmHg, pulse is 91/min, and respirations are 18/min. On exam, he is well-appearing and in no acute distress. A straight leg raise is negative. A valsalva maneuver does not worsen his pain. Which of the following is the most appropriate test to confirm this patient's diagnosis?
Q9
A 25-year-old man presents with progressive weakness and urinary retention. MRI of the spine shows an intramedullary lesion from T10-T12 with expansion of the spinal cord and syrinx formation. The conus medullaris is identified at the L1-L2 level (normal: L1-L2). The filum terminale appears thickened at 3 mm. CSF flow study shows obstruction at the lesion site. Evaluate these radiologic landmarks and their relationships to determine the neurological level most likely affected.
Q10
A 58-year-old woman with breast cancer undergoes staging CT. The scan shows a solitary 2 cm lesion in the liver at the junction of segments IVa, V, and VIII, directly adjacent to the middle hepatic vein. PET scan shows FDG avidity. The oncologist requests evaluation for surgical resection. The radiologist notes the lesion's relationship to the portal vein bifurcation (Cantlie's line). Evaluate the radiologic anatomical landmarks to determine resectability and surgical approach.
Neurological radiologic landmarks US Medical PG Practice Questions and MCQs
Question 1: A 67-year-old female patient is brought to the emergency department after her daughter noticed she has been having meaningless speech. When assessing the patient, she calls the chair a table, and at times would make up new words. She does not appear to be aware of her deficit, and is carrying on an empty conversation. Her speech is fluent, but with paraphasic errors. Her repetition is impaired. On physical examination, a right upper quadrant field-cut is appreciated, with impairment in comprehension and repetition. Which of the following structures is most likely involved in this patient’s presentation?
A. Superior temporal gyrus (Correct Answer)
B. Arcuate fasciculus
C. Inferior frontal gyrus
D. Frontal lobe, sparing Brodmann's area 44 and 45
E. Arcuate fasciculus, inferior frontal gyrus, and superior temporal gyrus
Explanation: ***Superior temporal gyrus***
- The patient's presentation of **fluent aphasia** with **paraphasic errors**, **impaired comprehension**, **impaired repetition**, and **lack of awareness** of the deficit is classic for **Wernicke's aphasia**.
- **Wernicke's area**, located in the posterior part of the **superior temporal gyrus** (Brodmann area 22) in the dominant hemisphere, is responsible for language comprehension.
*Arcuate fasciculus*
- Damage to the **arcuate fasciculus** typically causes **conduction aphasia**, characterized by **impaired repetition** with relatively preserved comprehension and fluent speech.
- However, it does not explain the significant comprehension deficits and paraphasic errors seen in this patient to the same extent as a Wernicke's lesion.
*Inferior frontal gyrus*
- The **inferior frontal gyrus** (Brodmann areas 44 and 45) is commonly associated with **Broca's area**, responsible for language production.
- Damage here would result in **non-fluent aphasia** with effortful speech and relatively preserved comprehension, which is contrary to the patient's fluent speech.
*Frontal lobe, sparing Brodmann's area 44 and 45*
- While damage to other parts of the **frontal lobe** can cause various cognitive deficits, sparing Broca's area (44 and 45) would generally not result in the specific pattern of **fluent aphasia** with severe comprehension and repetition impairment seen here.
- This option does not precisely localize the critical language areas affected.
*Arcuate fasciculus, inferior frontal gyrus, and superior temporal gyrus*
- While damage to all these areas would certainly cause severe aphasia, the specific constellation of symptoms—**fluent speech**, **poor comprehension**, **poor repetition**, and **paraphasic errors**—points most directly and primarily to involvement of the **superior temporal gyrus** (Wernicke's area).
- While some level of repetition impairment (seen in Wernicke's aphasia) implies some involvement in the broader language network, a lesion centered in the superior temporal gyrus is the most parsimonious explanation for this classic presentation.
Question 2: A 40-year-old man is brought to the emergency department after sustaining multiple lacerations during a bar fight. The patient’s wife says that he has been showing worsening aggression and has been involved in a lot of arguments and fights for the past 2 years. The patient has no significant past medical or psychiatric history and currently takes no medications. The patient cannot provide any relevant family history since he was adopted as an infant. His vitals are within normal limits. On physical examination, the patient looks apathetic and grimaces repeatedly. Suddenly, his arms start to swing by his side in an uncontrolled manner. Which area of the brain is most likely affected in this patient?
A. Cerebral cortex
B. Caudate nucleus (Correct Answer)
C. Cerebellum
D. Medulla oblongata
E. Substantia nigra
Explanation: **Caudate nucleus**
- The patient exhibits features like **worsening aggression**, **apathy**, and **uncontrolled, sudden movements** of the limbs, which are characteristic of Huntington's disease, a condition primarily affecting the **caudate nucleus**.
- **Huntington's disease** is an autosomal dominant neurodegenerative disorder linked to a trinucleotide repeat expansion (CAG) on chromosome 4, leading to atrophy of the **caudate and putamen**.
*Cerebral cortex*
- While damage to the cerebral cortex can cause personality changes and motor deficits, the specific combination of **choreiform movements** and progressive cognitive/behavioral decline seen here is more indicative of a basal ganglia disorder like Huntington's.
- Cortical lesions more commonly present with **focal neurological deficits** such as hemiparesis, aphasia, or sensory loss, which are not the primary features described.
*Cerebellum*
- Damage to the cerebellum typically results in **ataxia**, **dysmetria**, **intention tremor**, and problems with balance and coordination.
- The patient's **uncontrolled, sudden limb movements** are characteristic of chorea, not cerebellar dysfunction.
*Medulla oblongata*
- The medulla oblongata is crucial for vital autonomic functions such as **breathing, heart rate, and blood pressure regulation**.
- Lesions in this area would likely cause life-threatening symptoms, including **respiratory failure** or severe cardiovascular instability, which are not present in this patient.
*Substantia nigra*
- Damage or degeneration of the substantia nigra is primarily associated with **Parkinson's disease**, leading to symptoms like **bradykinesia**, **rigidity**, **resting tremor**, and **postural instability**.
- The patient's **hyperkinetic movements** (choreiform movements) are opposite to the hypokinetic presentation of Parkinson's disease.
Question 3: In a patient with acute myocardial ischemia, which of the following cardiovascular structures is at greatest risk of damage?
A. Pulmonary valve
B. Cardiac conduction system (Correct Answer)
C. Coronary artery
D. Cardiac septum
E. Temporal artery
Explanation: ***Cardiac conduction system***
- The **cardiac conduction system** is highly dependent on a constant oxygen supply, and its disruption by ischemia can lead to serious **arrhythmias** and **heart blocks**.
- Ischemia in critical areas like the **AV node** (supplied by the RCA) or the **bundle branches** can severely impair the heart's electrical activity.
*Pulmonary valve*
- The **pulmonary valve** is primarily a passive structure and is generally not directly damaged by acute myocardial ischemia.
- Its function is more affected by changes in **pulmonary artery pressure** or **ventricular remodeling**, not immediate ischemic injury.
*Coronary artery*
- While **coronary artery disease (CAD)** is the *cause* of myocardial ischemia, the coronary artery itself is not the structure *damaged* in the sense of functional impairment due to lack of blood flow in acute ischemia.
- The damage occurs downstream in the **myocardium** that the artery supplies.
*Cardiac septum*
- The **cardiac septum** can be damaged by myocardial ischemia, particularly the **interventricular septum**, leading to complications like **septal rupture**.
- However, the conduction system is at *greatest* immediate risk of functional damage leading to life-threatening events due to its critical role in rhythm generation.
*Temporal artery*
- The **temporal artery** is a blood vessel located in the head, entirely separate from the heart.
- It is not involved in myocardial ischemia and is not at risk of damage from a cardiac event.
Question 4: A 57-year-old man is brought to the physician for worsening mental status over the past 2 months. His wife reports he was initially experiencing lapses in memory and over the past 3 weeks he has begun having difficulties performing activities of daily living. Yesterday, he became lost heading to the post office down the street. He has hypertension treated with lisinopril and hydrochlorothiazide. Vital signs are within normal limits. He is alert but verbally uncommunicative. Muscle strength is normal. Reflexes are 2+ in bilateral upper and lower extremities. He has diffuse involuntary muscle jerking that can be provoked by loud noises. Mental status examination shows a blunt affect. A complete blood count and serum concentrations of glucose, creatinine, and electrolytes are within the reference range. Which of the following is the most likely diagnosis?
A. Parkinson's disease
B. Creutzfeldt-Jakob disease (Correct Answer)
C. Alzheimer's disease
D. Normal pressure hydrocephalus
E. Huntington's disease
Explanation: ***Creutzfeldt-Jakob disease***
- The rapid progression of **dementia**, combined with **myoclonus** (involuntary muscle jerking provoked by loud noises, also known as **startle myoclonus**), is highly characteristic of Creutzfeldt-Jakob disease (CJD).
- CJD is a **prion disease** that causes spongiform encephalopathy, leading to rapidly progressive neurologic decline over weeks to months, typically fatal within a year.
*Parkinson's disease*
- Characterized by a classic triad of **bradykinesia**, **rigidity**, and **resting tremor**, none of which are prominently described in this patient.
- While dementia can occur in later stages of Parkinson's, the **rapid progression** and presence of **myoclonus** are atypical.
*Alzheimer's disease*
- Presents with a **gradual onset** and **slow progression** of memory loss and cognitive decline, typically over many years, which contrasts with this patient's **2-month rapid deterioration**.
- **Myoclonus** is not a common early feature and the rate of progression is inconsistent with Alzheimer's.
*Normal pressure hydrocephalus*
- Classically presents with a triad of **gait disturbance**, **urinary incontinence**, and **dementia**; while dementia is present, the other two key features are not mentioned, and the progression is faster than typically seen.
- The characteristic **myoclonus** is not a feature of normal pressure hydrocephalus.
*Huntington's disease*
- Genetically inherited disorder characterized by **chorea** (involuntary, jerky movements) and psychiatric symptoms, followed by dementia.
- The onset is typically earlier (30s-40s) and the primary motor symptom is chorea, not the **startle myoclonus with rapid progression** observed here.
Question 5: An 82-year-old right-handed woman is brought in by ambulance after being found down in her home. On presentation, she is found to be awake but does not follow directions or respond to questions. She is able to speak and produces a fluent string of nonsensical words and sounds. She does not appear to be bothered by her deficits. Subsequent neurologic exam finds that the patient is unable to comprehend any instructions and is also unable to repeat phrases. CT scan reveals an acute stroke to her left hemisphere. Damage to which of the following structures would be most likely to result in this pattern of deficits?
A. Precentral gyrus
B. Superior temporal gyrus (Correct Answer)
C. Arcuate fasciculus
D. Inferior frontal gyrus
E. Watershed zone
Explanation: ***Superior temporal gyrus***
- This patient presents with **fluent aphasia** (speaking nonsensical words), severely impaired **comprehension**, and impaired **repetition**. This triad is characteristic of **Wernicke's aphasia**.
- **Wernicke's area**, responsible for language comprehension, is located in the **posterior part of the superior temporal gyrus** in the dominant hemisphere (typically left).
*Precentral gyrus*
- The **precentral gyrus** contains the **primary motor cortex** and its damage would primarily cause contralateral motor deficits (e.g., **hemiparesis** or **hemiplegia**).
- This area is not directly involved in language comprehension or production of fluent but nonsensical speech.
*Arcuate fasciculus*
- Damage to the **arcuate fasciculus**, a white matter tract connecting Broca's and Wernicke's areas, results in **conduction aphasia**.
- In **conduction aphasia**, comprehension and fluency are relatively preserved, but **repetition is severely impaired**. This patient also has impaired comprehension.
*Inferior frontal gyrus*
- The **inferior frontal gyrus** houses **Broca's area**, which is responsible for **language production and motor aspects of speech**.
- Damage to this area typically causes **Broca's aphasia**, characterized by **non-fluent speech**, preserved comprehension, and impaired repetition. This patient has fluent speech.
*Watershed zone*
- **Watershed infarcts** occur at the borders between major arterial territories due to hypoperfusion, often leading to **transcortical aphasias**.
- While transcortical sensory aphasia involves impaired comprehension and fluent speech, **repetition is preserved**, which is not the case here.
Question 6: Arrange in sequence the structures involved in the direct pathway (1=Striatum, 2=GPi, 3=Thalamus, 4=Cortex output, 5=Cortex input):-
A. 1,3,4,2,5
B. 5,1,2,3,4 (Correct Answer)
C. 1,2,3,4,5
D. 5,4,2,3,1
E. 5,1,3,2,4
Explanation: ***5,1,2,3,4***
- The direct pathway of the basal ganglia begins with the **cortex** (5) sending excitatory signals to the **striatum** (1).
- The striatum then inhibits the **internal globus pallidus (GPi)** (2), which disinhibits the **thalamus** (3), leading to excitation of the **cortex** (4).
- This is the correct sequence: **Cortex input → Striatum → GPi → Thalamus → Cortex output**.
*1,3,4,2,5*
- This sequence is incorrect as it starts with the striatum instead of cortical input.
- The direct pathway does not begin with striatal activity; the cortex must first activate the striatum.
*1,2,3,4,5*
- This order is incorrect because it implies the pathway starts at the striatum rather than the cortex.
- The cortex should be the starting point (5) and the ending point (4) of the motor loop.
*5,4,2,3,1*
- This sequence is incorrect as it places cortex output (4) before the striatum receives input.
- This reverses the functional flow and does not follow the **disinhibitory mechanism** of the direct pathway.
*5,1,3,2,4*
- This sequence incorrectly places the thalamus (3) before the GPi (2).
- In the direct pathway, the striatum must first inhibit the GPi before the thalamus can be disinhibited.
Question 7: A 68-year-old man is brought to the emergency department by ambulance after he was found to be altered at home. Specifically, his wife says that he fell and was unable to get back up while walking to bed. When she approached him, she found that he was unable to move his left leg. His past medical history is significant for hypertension, atrial fibrillation, and diabetes. In addition, he has a 20-pack-year smoking history. On presentation, he is found to still have difficulty moving his left leg though motor function in his left arm is completely intact. The cause of this patient's symptoms most likely occurred in an artery supplying which of the following brain regions?
A. Motor cortex (ACA) (Correct Answer)
B. Cerebellum (PICA/SCA)
C. Occipital cortex (PCA)
D. Brainstem (Vertebrobasilar)
E. Motor cortex (MCA)
Explanation: ***Motor cortex (ACA)***
- The patient's inability to move his **left leg** while his **left arm** remains intact points to an injury in the **right cerebral hemisphere** affecting the leg area of the motor cortex.
- The leg area of the **primary motor cortex** is primarily supplied by the **anterior cerebral artery (ACA)**, making an ACA stroke the most likely cause.
*Motor cortex (MCA)*
- The **middle cerebral artery (MCA)** primarily supplies the motor cortex areas responsible for the **face and arm**, not typically isolated leg weakness.
- If the MCA were affected, you would expect to see involvement of the face and/or arm on the contralateral side in addition to leg weakness.
*Brainstem (Vertebrobasilar)*
- A **brainstem stroke** would likely present with more widespread neurological deficits, including **cranial nerve palsies**, ataxia, or altered consciousness.
- Isolated contralateral leg weakness without arm involvement is not characteristic of a brainstem lesion.
*Cerebellum (PICA/SCA)*
- The **cerebellum** is primarily involved in **coordination and balance**, not direct motor strength.
- A cerebellar stroke would present with symptoms like **ataxia**, dysarthria, or nystagmus, not isolated paralysis.
*Occipital cortex (PCA)*
- The **occipital cortex** is primarily responsible for **vision**.
- A posterior cerebral artery (PCA) stroke would typically cause **visual field defects** (e.g., contralateral homonymous hemianopia) rather than motor weakness.
Question 8: A 65-year-old man is referred by his primary care provider to a neurologist for leg pain. He reports a 6-month history of progressive bilateral lower extremity pain that is worse in his left leg. The pain is 5/10 in severity at its worst and is described as a "burning" pain. He has noticed that the pain is acutely worse when he walks downhill. He has started riding his stationary bike more often as it relieves his pain. His past medical history is notable for hypertension, diabetes mellitus, and a prior myocardial infarction. He also sustained a distal radius fracture the previous year after falling on his outstretched hand. He takes aspirin, atorvastatin, metformin, glyburide, enalapril, and metoprolol. He has a 30-pack-year smoking history and drinks 2-3 glasses of wine with dinner every night. His temperature is 99°F (37.2°C), blood pressure is 145/85 mmHg, pulse is 91/min, and respirations are 18/min. On exam, he is well-appearing and in no acute distress. A straight leg raise is negative. A valsalva maneuver does not worsen his pain. Which of the following is the most appropriate test to confirm this patient's diagnosis?
A. Electromyography
B. Ankle-brachial index
C. Computerized tomography myelography
D. Magnetic resonance imaging (Correct Answer)
E. Radiography
Explanation: **Magnetic resonance imaging**
- **Magnetic resonance imaging (MRI)** is the most appropriate test for diagnosing **lumbar spinal stenosis** because it provides detailed imaging of soft tissues, including the **spinal cord, nerve roots, and intervertebral discs**.
- The patient's symptoms of bilateral lower extremity pain, worse with downhill walking and relieved by stationary biking (which typically involves a flexed spine), are classic for **neurogenic claudication** caused by spinal stenosis.
*Electromyography*
- **Electromyography (EMG)** measures electrical activity of muscles and can identify **radiculopathy** or **neuropathy** but does not directly visualize the spinal canal or its contents to diagnose the cause of nerve compression.
- While it could show nerve root involvement, it wouldn't be the primary diagnostic test to confirm **spinal stenosis** itself.
*Ankle-brachial index*
- The **ankle-brachial index (ABI)** is used to diagnose **peripheral artery disease (PAD)**, which can also cause leg pain with activity (**vascular claudication**).
- However, the patient's pain being worse with downhill walking and relieved by spine flexion (like on a stationary bike) is more consistent with **neurogenic claudication** than vascular claudication.
*Computerized tomography myelography*
- **CT myelography** involves injecting contrast into the spinal canal and then performing a CT scan. While it can visualize the spinal canal, it is more invasive than MRI and exposes the patient to **ionizing radiation**.
- It is typically reserved for cases where MRI is contraindicated (e.g., pacemakers) or when MRI findings are inconclusive.
*Radiography*
- **Radiography (X-rays)** can show bony changes such as **spondylosis** and **degenerative disc disease**, which are often associated with spinal stenosis.
- However, X-rays do not directly visualize the **spinal cord, nerve roots, or soft tissue compression**, making them inadequate for confirming spinal stenosis as the cause of neurogenic claudication.
Question 9: A 25-year-old man presents with progressive weakness and urinary retention. MRI of the spine shows an intramedullary lesion from T10-T12 with expansion of the spinal cord and syrinx formation. The conus medullaris is identified at the L1-L2 level (normal: L1-L2). The filum terminale appears thickened at 3 mm. CSF flow study shows obstruction at the lesion site. Evaluate these radiologic landmarks and their relationships to determine the neurological level most likely affected.
A. Cauda equina only, sparing upper motor neurons
B. Conus medullaris with mixed upper and lower motor neuron signs
C. Thoracic cord with pure upper motor neuron signs below T10
D. Epiconus (T12-L1) with distal lower extremity and sphincter dysfunction (Correct Answer)
E. Lower thoracic nerve roots with radicular pain pattern only
Explanation: ***Epiconus (T12-L1) with distal lower extremity and sphincter dysfunction***
- The **epiconus** encompasses spinal segments **L4-S2**, which anatomically correspond to the vertebral levels **T12-L1**; a lesion here characteristically causes **bladder/bowel dysfunction** and weakness.
- This location accounts for the **urinary retention** and progressive weakness while sparing the higher thoracic functions, fitting the intramedullary expansion seen at the lower thoracic-lumbar transition.
*Cauda equina only, sparing upper motor neurons*
- A **cauda equina** lesion involves the **nerve roots** below the level of the conus (L2) and presents with **purely lower motor neuron (LMN)** signs.
- The intramedullary nature of the lesion at **T10-T12** indicates involvement of the spinal cord itself, which would typically involve **upper motor neuron (UMN)** features or a mixed picture.
*Conus medullaris with mixed upper and lower motor neuron signs*
- The **conus medullaris** corresponds to segments **S3-Co1** and is located at the vertebral level of **L1-L2**, which is distal to the primary lesion core reported at T10.
- Conus lesions typically present with **early autonomic dysfunction** and symmetric saddle anesthesia, but the lesion described extends higher into the **epiconus** region.
*Thoracic cord with pure upper motor neuron signs below T10*
- A lesion at the **mid-thoracic cord** (T10-T12) would primarily produce **spasticity** and hyperreflexia typical of **UMN syndrome** in the lower extremities.
- However, because this specific region houses the lower lumbar and upper sacral segments (the **epiconus**), it frequently yields a complex focal clinical picture involving specific root-level deficits.
*Lower thoracic nerve roots with radicular pain pattern only*
- **Radicular pain** results from compression of exiting **nerve roots**, whereas an **intramedullary lesion** like the one described involves the central cord parenchyma.
- The presence of **urinary retention** and a **syrinx** indicates deep spinal cord involvement and syrinx-related neurological deficits, not mere peripheral root irritation.
Question 10: A 58-year-old woman with breast cancer undergoes staging CT. The scan shows a solitary 2 cm lesion in the liver at the junction of segments IVa, V, and VIII, directly adjacent to the middle hepatic vein. PET scan shows FDG avidity. The oncologist requests evaluation for surgical resection. The radiologist notes the lesion's relationship to the portal vein bifurcation (Cantlie's line). Evaluate the radiologic anatomical landmarks to determine resectability and surgical approach.
A. Unresectable due to middle hepatic vein involvement; systemic therapy only
B. Central hepatectomy with middle hepatic vein reconstruction (Correct Answer)
C. Right hepatectomy with adequate future liver remnant assessment
D. Extended right hepatectomy including segment IV
E. Radiofrequency ablation given central location
Explanation: ***Central hepatectomy with middle hepatic vein reconstruction***
- A lesion involving segments **IVa, V, and VIII** is centrally located; a **central hepatectomy** (or mesohepatectomy) allows for the preservation of the **peripheral right and left segments**, maintaining a larger **future liver remnant (FLR)**.
- Involvement of the **middle hepatic vein** requires skilled surgical planning, including possible **vascular reconstruction** or ensuring adequate **venous drainage** of the remaining segments to avoid congestion.
*Unresectable due to middle hepatic vein involvement; systemic therapy only*
- Engagement with a major hepatic vein does not automatically render a lesion **unresectable** in modern hepatobiliary surgery if the other hepatic veins and **portal inflow** are intact.
- Radical resection can still be achieved through **advanced surgical techniques** or by performing an **extended hepatectomy** if the patient's liver function permits.
*Right hepatectomy with adequate future liver remnant assessment*
- A standard **right hepatectomy** removes segments V through VIII, but since this lesion involves segment **IVa** (part of the left hemiliver), a standard right procedure might leave a **positive medial margin**.
- Although assessment of the **FLR** is critical, a standard right hepatectomy alone does not address the involvement of the **middle hepatic vein** and segment IVa effectively.
*Extended right hepatectomy including segment IV*
- An **extended right hepatectomy** (right trisectionectomy) would involve removing segments IV through VIII, which provides a high chance of **R0 resection** for a central lesion.
- However, this is a much more morbid procedure than a **central hepatectomy** and may not be necessary if the patient has a limited **liver reserve** or if the disease is localized.
*Radiofrequency ablation given central location*
- **Radiofrequency ablation (RFA)** is generally contraindicated for 2 cm lesions directly adjacent to major vessels like the **middle hepatic vein** due to the **heat-sink effect**.
- The blood flow in the large vein dissipates the thermal energy, leading to incomplete treatment and a high risk of **local recurrence** compared to surgical resection.
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