A 31-year-old Israeli male with a history of heavy smoking presents to your office with painful ulcerations on his hands and feet. Upon examination, he is found to have hypersensitivity to intradermally injected tobacco extract. Which of the following processes is most likely responsible for his condition?
Q32
A 15-year-old African-American boy is brought to the physician because of left-sided groin pain and difficulty walking for 3 weeks. He reports having pain at rest and increased pain with activity. He recently started playing flag football but does not recall any trauma. He has had many episodes of joint and bone pain that required hospitalization in the past. He is at the 25th percentile for height and 20th percentile for weight. His temperature is 37°C (98.6°F), blood pressure is 120/80 mm Hg, and pulse is 90/min. Examination shows tenderness over the lateral aspect of the hip with no swelling, warmth, or erythema. There is pain with passive internal rotation of the left hip. The remainder of the examination shows no abnormalities. Leukocyte count is 9,000/mm3. Which of the following conditions is the most likely cause of the patient's current symptoms?
Q33
A previously healthy 82-year-old man dies in a motor vehicle collision. At autopsy, the heart shows slight ventricular thickening. There are abnormal, insoluble aggregations of protein filaments in beta-pleated linear sheets in the ventricular walls and, to a lesser degree, in the atria and lungs. No other organs show this abnormality. Bone marrow examination shows no plasma cell dyscrasia. The abnormal protein aggregations are most likely composed of which of the following?
Q34
A 56-year-old male died in a motor vehicle accident. Autopsy reveals extensive atherosclerosis of his left anterior descending artery marked by intimal smooth muscle and collagen proliferation. Which of the following is implicated in recruiting smooth muscle cells from the media to intima in atherosclerotic lesions?
Q35
A 54-year-old man was brought to the emergency room due to acute onset of slurred speech while at work, after which he lost consciousness. The patient's wife says this occurred approximately 30 minutes ago. Past medical history is significant for poorly controlled hypertension and type 2 diabetes mellitus. His blood pressure is 90/50 mm Hg, respiratory rate is 12/min, and heart rate is 48/min. The patient passes away shortly after arriving at the hospital. At autopsy, bilateral wedge-shaped strips of necrosis are seen in this patient's brain in the medial temporal lobe structures. Which of the following is the most likely location of these necrotic cells?
Q36
An 18-year-old man presents with a sudden loss of consciousness while playing college football. There was no history of a concussion. Echocardiography shows left ventricular hypertrophy and increased thickness of the interventricular septum. Which is the most likely pathology underlying the present condition?
Q37
A 72-year-old man who was involved in a traffic collision is brought to the emergency room by the ambulance service. He was in shock and comatose at the time of presentation. On examination, the heart rate is 60/min, and the blood pressure is 70/40 mm Hg. The patient dies, despite resuscitative efforts. Autopsy reveals multiple internal hemorrhages and other evidence of ischemic damage affecting the lungs, kidneys, and brain. The patient’s heart shows evidence of gross anomaly similar to the picture. While acute hypovolemia is the likely cause of the ischemic changes seen in the lungs, kidneys, and brain, which of the following best explains the gross anomaly of his heart?
Q38
A 62-year-old man comes to the physician for evaluation of multiple red spots on his trunk. He first noticed these several months ago, and some appear to have increased in size. One day ago, he scratched one of these spots, and it bled for several minutes. Physical examination shows the findings in the photograph. Which of the following is the most likely diagnosis?
Q39
A 53-year-old man presents to the emergency department with a complaint of chest pain for 5 hours. The chest pain is continuous and squeezing in nature, not relieved by aspirin, and not related to the position of respiration. The blood pressure was 102/64 mm Hg, and the heart rate was 73/min. On physical examination, heart sounds are normal on auscultation. His ECG shows sinus rhythm with ST-segment elevation in leads II and III, aVF, and reciprocal segment depression in precordial leads V1–V6. Tissue plasminogen activator therapy is administered to the patient intravenously within 1 hour of arrival at the hospital. After 6 hours of therapy, the patient’s clinical condition starts to deteriorate. An ECG now shows ventricular fibrillation. The patient dies, despite all the efforts made in the intensive care unit. What is the most likely pathological finding to be expected in his heart muscles on autopsy?
Q40
A 59-year-old presents with right-sided hemiparesis, right-sided sensory loss, leftward eye deviation, and slurred speech. A head CT is performed which is significant for a hyperdense lesion affecting the putamen. The patient has a history of hypertension treated with hydrochlorothiazide, but is non-adherent. Which of the following is most likely associated with the cause of this patient’s neurological deficits?
Cardiovascular US Medical PG Practice Questions and MCQs
Question 31: A 31-year-old Israeli male with a history of heavy smoking presents to your office with painful ulcerations on his hands and feet. Upon examination, he is found to have hypersensitivity to intradermally injected tobacco extract. Which of the following processes is most likely responsible for his condition?
A. Eosinophil-rich granulomatous inflammation
B. Segmental vasculitis of small and medium-sized arteries (Correct Answer)
C. Increased endothelial permeability
D. Necrotizing inflammation involving renal arteries
E. Concentric thickening of the arteriolar wall
Explanation: ***Segmental vasculitis of small and medium-sized arteries***
- This presentation is highly characteristic of **Buerger's disease (thromboangiitis obliterans)**, which is a **segmental, inflammatory vasculitis** primarily affecting small and medium-sized arteries and veins of the hands and feet.
- Key features include **painful ulcerations of the hands and feet**, a strong association with **heavy smoking**, and often occurs in young to middle-aged adult males, with a higher prevalence in certain populations (e.g., of Israeli or Asian descent).
*Eosinophil-rich granulomatous inflammation*
- This type of inflammation is characteristic of conditions like **Churg-Strauss syndrome (eosinophilic granulomatosis with polyangiitis)**.
- Churg-Strauss syndrome typically involves asthma, allergic rhinitis, and eosinophilia, with vasculitis of small to medium vessels, not primarily affecting the distal extremities in this manner or having such a strong tobacco link.
*Increased endothelial permeability*
- While increased endothelial permeability is a feature of general inflammation and can contribute to edema, it is not the primary underlying pathological process causing the **segmental occlusive vasculitis** seen in Buerger's disease.
- This describes a general vascular response rather than a specific disease pathology.
*Necrotizing inflammation involving renal arteries*
- **Necrotizing inflammation of renal arteries** is characteristic of conditions like **polyarteritis nodosa (PAN)** or other systemic vasculitides that can affect renal vessels.
- These conditions typically present with systemic symptoms, hypertension, and renal dysfunction, which are not described in this patient.
*Concentric thickening of the arteriolar wall*
- **Concentric thickening of arteriolar walls** is a hallmark of **hypertensive arteriolosclerosis** or other forms of systemic hypertension.
- This finding would explain chronic end-organ damage from hypertension but does not account for the acute, painful ulcerations in the extremities associated with heavy smoking.
Question 32: A 15-year-old African-American boy is brought to the physician because of left-sided groin pain and difficulty walking for 3 weeks. He reports having pain at rest and increased pain with activity. He recently started playing flag football but does not recall any trauma. He has had many episodes of joint and bone pain that required hospitalization in the past. He is at the 25th percentile for height and 20th percentile for weight. His temperature is 37°C (98.6°F), blood pressure is 120/80 mm Hg, and pulse is 90/min. Examination shows tenderness over the lateral aspect of the hip with no swelling, warmth, or erythema. There is pain with passive internal rotation of the left hip. The remainder of the examination shows no abnormalities. Leukocyte count is 9,000/mm3. Which of the following conditions is the most likely cause of the patient's current symptoms?
A. Avascular necrosis (Correct Answer)
B. Slipped capital femoral epiphysis
C. Septic arthritis
D. Stress fracture
E. Developmental dysplasia of the hip
Explanation: ***Avascular necrosis***
- The patient's history of **recurrent bone pain crises** requiring hospitalization strongly suggests **sickle cell disease**, which significantly increases the risk of avascular necrosis (AVN) due to **vaso-occlusion** in the bone.
- **Groin pain**, difficulty walking, and pain with internal rotation of the hip are classic symptoms of **femoral head AVN**, especially in a young patient with underlying sickle cell disease.
*Slipped capital femoral epiphysis*
- SCFE typically occurs in **obese adolescents** experiencing a growth spurt, causing the femoral head to slip off the growth plate. This patient is at the 25th percentile for height and 20th percentile for weight, hence is not obese.
- While it presents with hip/groin pain and difficulty walking, the underlying **sickle cell history** makes AVN a more fitting diagnosis.
*Septic arthritis*
- Septic arthritis presents with **acute onset** severe pain, **fever**, and signs of **inflammation** (swelling, warmth, erythema) over the joint, which are absent in this case.
- The patient's **leukocyte count** is normal, which makes septic arthritis less likely.
*Stress fracture*
- A stress fracture usually results from **repetitive microtrauma** due to increased activity, but this patient's pain is at rest and he reports no specific trauma.
- While pain with activity is present, the **recurrent bone pain history** and systemic nature of sickle cell disease point away from a purely mechanical injury.
*Developmental dysplasia of the hip*
- DDH is typically diagnosed in **infancy or early childhood** due to hip instability or leg length discrepancy.
- It would be highly unusual for DDH to present acutely at age 15 with these symptoms, and there is no history of prior hip issues.
Question 33: A previously healthy 82-year-old man dies in a motor vehicle collision. At autopsy, the heart shows slight ventricular thickening. There are abnormal, insoluble aggregations of protein filaments in beta-pleated linear sheets in the ventricular walls and, to a lesser degree, in the atria and lungs. No other organs show this abnormality. Bone marrow examination shows no plasma cell dyscrasia. The abnormal protein aggregations are most likely composed of which of the following?
A. Immunoglobulin light chain
B. Normal transthyretin (Correct Answer)
C. β-amyloid peptide
D. Natriuretic peptide
E. Serum amyloid A
Explanation: ***Normal transthyretin***
- The patient's age and the localization of the amyloid deposits primarily in the **heart (ventricular walls and atria)**, along with normal bone marrow and the absence of systemic involvement, are highly characteristic of **senile systemic amyloidosis** which is caused by wild-type (normal) transthyretin.
- **Transthyretin** is a transport protein for thyroid hormones and retinol; with aging, it can misfold and deposit as amyloid fibrils, particularly in the heart.
*Immunoglobulin light chain*
- This typically causes **primary amyloidosis (AL amyloidosis)**, which is associated with a **plasma cell dyscrasia** and multiorgan involvement, neither of which are present in this case.
- AL amyloidosis often affects the kidneys, liver, and nerves, in addition to the heart, which is not described here.
*β-amyloid peptide*
- This protein forms plaques primarily in the **brain** in **Alzheimer's disease** and cerebral amyloid angiopathy, not typically causing significant cardiac amyloidosis.
- While it can be found in some vascular structures, its primary association is with neurodegenerative disease.
*Natriuretic peptide*
- **Natriuretic peptides (ANP, BNP)** are hormones involved in cardiovascular homeostasis and do not form amyloid deposits.
- They are markers of heart failure, not the causative agents of amyloidosis.
*Serum amyloid A*
- This protein is associated with **secondary amyloidosis (AA amyloidosis)**, which develops as a complication of chronic inflammatory diseases or infections.
- The patient's history does not mention any such underlying conditions, and the deposition pattern is not typical for AA amyloidosis.
Question 34: A 56-year-old male died in a motor vehicle accident. Autopsy reveals extensive atherosclerosis of his left anterior descending artery marked by intimal smooth muscle and collagen proliferation. Which of the following is implicated in recruiting smooth muscle cells from the media to intima in atherosclerotic lesions?
A. Vascular endothelial growth factor
B. Platelet-derived growth factor (Correct Answer)
C. Factor V Leiden
D. IgE
E. Prostacyclin
Explanation: ***Platelet-derived growth factor***
- **Platelet-derived growth factor (PDGF)** is a crucial **chemotactic** and **mitogenic** factor for **smooth muscle cells (SMCs)**, promoting their migration from the tunica media to the tunica intima and subsequent proliferation in atherosclerotic lesions.
- Released by activated platelets, macrophages, and endothelial cells, PDGF contributes significantly to the **fibroproliferative response** seen in **atherosclerosis**.
*Vascular endothelial growth factor*
- **Vascular endothelial growth factor (VEGF)** is primarily involved in **angiogenesis** and **vascular permeability**.
- While angiogenesis can play a role in advanced atherosclerotic plaques, VEGF is not the primary mediator of **smooth muscle cell migration** and proliferation into the intima.
*Factor V Leiden*
- **Factor V Leiden** is a **genetic mutation** that increases the risk of **thrombosis** due to resistance to inactivation by activated protein C.
- It is a risk factor for **venous thromboembolism** and does not directly recruit smooth muscle cells to the intima in atherosclerosis.
*IgE*
- **Immunoglobulin E (IgE)** is an antibody class primarily involved in **allergic reactions** and **parasitic infections**.
- IgE has no direct role in the recruitment or proliferation of **smooth muscle cells** in the context of atherosclerosis.
*Prostacyclin*
- **Prostacyclin (PGI2)** is a **vasodilator** and a potent **inhibitor of platelet aggregation**.
- It works to prevent thrombus formation and has a protective role against atherosclerosis, rather than promoting **smooth muscle cell migration**.
Question 35: A 54-year-old man was brought to the emergency room due to acute onset of slurred speech while at work, after which he lost consciousness. The patient's wife says this occurred approximately 30 minutes ago. Past medical history is significant for poorly controlled hypertension and type 2 diabetes mellitus. His blood pressure is 90/50 mm Hg, respiratory rate is 12/min, and heart rate is 48/min. The patient passes away shortly after arriving at the hospital. At autopsy, bilateral wedge-shaped strips of necrosis are seen in this patient's brain in the medial temporal lobe structures. Which of the following is the most likely location of these necrotic cells?
A. Frontal lobe
B. Hippocampus (Correct Answer)
C. Cortex or cerebral hemisphere
D. Substantia nigra
E. Caudate nucleus
Explanation: ***Hippocampus***
- The description of wedge-shaped necrosis just below the **medial temporal lobes** points directly to the **hippocampus**, which is highly susceptible to **ischemic injury**.
- The patient's **hypotension** and subsequent death suggest an event causing global cerebral hypoperfusion, making the hippocampus vulnerable due to its high metabolic demand and sensitivity to oxygen deprivation.
*Frontal lobe*
- While the frontal lobe can be affected by ischemia, its location is not consistent with "just below the **medial temporal lobes**" and the necrotic pattern described is more characteristic of specific vulnerable regions.
- Involvement of the frontal lobe would typically present with different focal neurological deficits depending on the specific area affected, such as motor weakness or personality changes.
*Cortex or cerebral hemisphere*
- **Wedge-shaped necrosis** is a pattern often seen in watershed areas or specific vulnerable regions, not a general description for global cortical ischemia.
- While the cortex is broadly affected by global ischemia, the specific localization described is much more precise than "cortex or cerebral hemisphere."
*Substantia nigra*
- The substantia nigra is located in the **midbrain** and is primarily involved in motor control, not typically implicated in the described **wedge-shaped necrosis** pattern associated with global ischemia below the medial temporal lobes.
- Damage to the substantia nigra is more commonly associated with conditions like **Parkinson's disease**.
*Caudate nucleus*
- The caudate nucleus is part of the **basal ganglia**, located deep within the cerebral hemispheres, and is not described as being "just below the **medial temporal lobes**."
- Ischemic damage to the caudate nucleus would cause different symptoms and typically not present with the specific necrotizing pattern described.
Question 36: An 18-year-old man presents with a sudden loss of consciousness while playing college football. There was no history of a concussion. Echocardiography shows left ventricular hypertrophy and increased thickness of the interventricular septum. Which is the most likely pathology underlying the present condition?
A. Autoimmunity of myocardial fibers
B. Drug abuse
C. Viral infection
D. Mutation in the myosin heavy chain (Correct Answer)
E. Streptococcal infection
Explanation: ***Mutation in the myosin heavy chain***
- The presentation of **sudden loss of consciousness** (syncope) in a young athlete with **left ventricular hypertrophy** and **interventricular septal thickening** is classic for **hypertrophic cardiomyopathy (HCM)**.
- HCM is most commonly caused by **autosomal dominant mutations in genes** encoding sarcomeric proteins, with **beta-myosin heavy chain mutations** being the most frequent.
*Autoimmunity of myocardial fibers*
- Autoimmune conditions affecting the heart, such as **myocarditis** or **lupus carditis**, typically present with symptoms like **chest pain**, **dyspnea**, or signs of **heart failure**, which are not described here.
- While they can lead to cardiac dysfunction, they are less likely to cause isolated severe hypertrophy and sudden syncope in a young asymptomatic individual as the initial presentation.
*Drug abuse*
- **Stimulant drug abuse** (e.g., cocaine, amphetamines) can cause cardiomyopathy and arrhythmias, potentially leading to syncope.
- However, the specific echocardiographic findings of **marked septal hypertrophy** are not characteristic of drug-induced cardiomyopathy, which often manifests as **dilated cardiomyopathy** or global ventricular dysfunction.
*Viral infection*
- **Viral myocarditis** can cause cardiac inflammation, leading to **dilated cardiomyopathy** or arrhythmias, and can present with sudden cardiac death.
- While viral myocarditis can lead to some degree of hypertrophy, the prominent and isolated **asymmetric septal hypertrophy** and the chronic nature implied by the structural changes are less typical of acute or resolving viral infection.
*Streptococcal infection*
- **Rheumatic heart disease**, a sequela of **Streptococcus pyogenes infection**, primarily causes **valvular damage** (especially mitral stenosis or regurgitation) and less commonly diffuse myocardial involvement.
- It does not typically present with isolated severe **left ventricular hypertrophy** and **interventricular septal thickening** as the primary cardiac pathology leading to sudden syncope.
Question 37: A 72-year-old man who was involved in a traffic collision is brought to the emergency room by the ambulance service. He was in shock and comatose at the time of presentation. On examination, the heart rate is 60/min, and the blood pressure is 70/40 mm Hg. The patient dies, despite resuscitative efforts. Autopsy reveals multiple internal hemorrhages and other evidence of ischemic damage affecting the lungs, kidneys, and brain. The patient’s heart shows evidence of gross anomaly similar to the picture. While acute hypovolemia is the likely cause of the ischemic changes seen in the lungs, kidneys, and brain, which of the following best explains the gross anomaly of his heart?
A. Senile calcific aortic stenosis (Correct Answer)
B. Accumulation of amyloid in the myocardium
C. Mitral valve stenosis
D. Hypertrophic cardiomyopathy
E. Aortic valve regurgitation
Explanation: ***Senile calcific aortic stenosis***
- The patient's age (72 years) makes **senile calcific aortic stenosis** a very likely finding, as it is a degenerative condition common in the elderly leading to stiffening and calcification of the aortic valve.
- While the immediate cause of death was **hypovolemic shock**, the presence of an underlying **cardiac anomaly** could worsen the patient's ability to compensate for significant blood loss, contributing to the rapid decompensation observed.
- Gross pathology typically shows **calcified, thickened aortic valve leaflets** that are stenotic.
*Accumulation of amyloid in the myocardium*
- While **cardiac amyloidosis** can occur in the elderly and cause restrictive cardiomyopathy, it typically presents with **heart failure symptoms** and often results in thickened ventricular walls, which is not specifically indicated as the "gross anomaly" in this context.
- The sudden, acute decompensation due to trauma does not align as strongly with the chronic progression of amyloidosis as it does with a structural valvular issue exacerbated by shock.
*Mitral valve stenosis*
- **Mitral valve stenosis** is more often associated with **rheumatic heart disease** or congenital anomalies, which are less common in this age group as a primary, sudden anomaly.
- While it can lead to heart failure, the description of a "gross anomaly" in the context of acute decompensation and the patient's age points more towards a common degenerative valvular condition like aortic stenosis.
*Hypertrophic cardiomyopathy*
- **Hypertrophic cardiomyopathy (HCM)** is a genetic condition that typically presents earlier in life with symptoms of outflow obstruction or sudden cardiac death in young athletes.
- While HCM can present in older adults, the gross pathology shows **asymmetric septal hypertrophy** rather than valvular pathology.
- In a 72-year-old, age-related degenerative valve disease is more common than first presentation of genetic cardiomyopathy.
*Aortic valve regurgitation*
- Although **aortic regurgitation** can lead to cardiac remodeling and failure, it is less likely to be referred to simply as a "gross anomaly" in this context without more specific valvular description.
- **Senile calcific aortic stenosis** is a more common degenerative anomaly in this age group, and the question implies a common, age-related finding.
Question 38: A 62-year-old man comes to the physician for evaluation of multiple red spots on his trunk. He first noticed these several months ago, and some appear to have increased in size. One day ago, he scratched one of these spots, and it bled for several minutes. Physical examination shows the findings in the photograph. Which of the following is the most likely diagnosis?
A. Spider angioma
B. Pyogenic granuloma
C. Amelanotic melanoma
D. Seborrheic keratosis
E. Cherry angioma (Correct Answer)
Explanation: ***Cherry angioma***
- These are common benign vascular proliferations appearing as multiple **bright red to violaceous papules** on the trunk, often increasing in size and number with age.
- They are typically asymptomatic but can **bleed profusely with minor trauma** (e.g., scratching), as described in the vignette.
*Spider angioma*
- Characterized by a **central red papule** with radiating fine capillaries, resembling a spider's web, typically found on the face, neck, and upper trunk.
- They are often associated with **estrogen states (e.g., pregnancy, liver disease)** and do not usually present as multiple, increasing papules on the trunk that bleed easily from scratching a single lesion.
*Pyogenic granuloma*
- This is a solitary, rapidly growing, **exophytic vascular lesion** that often bleeds easily after trauma, but it typically presents as an isolated lesion rather than multiple scattered spots.
- While it looks similar to cherry angiomas, the history of **multiple lesions** that have increased in size over several months makes cherry angiomas a more likely diagnosis.
*Amelanotic melanoma*
- This form of melanoma lacks pigment, making it difficult to recognize, but it would typically present as a **solitary, irregular, rapidly growing lesion** that may bleed.
- The presence of **multiple, scattered red spots** is inconsistent with the typical presentation of amelanotic melanoma, which is a serious malignancy.
*Seborrheic keratosis*
- These are common **benign epidermal tumors** characterized by a "stuck-on" appearance, often pigmented (flesh-colored, tan, or dark brown), and may have a waxy or greasy texture.
- While some can be irritated and bleed, they are typically **not bright red vascular lesions** and the description of easily bleeding vascular spots does not fit their typical presentation.
Question 39: A 53-year-old man presents to the emergency department with a complaint of chest pain for 5 hours. The chest pain is continuous and squeezing in nature, not relieved by aspirin, and not related to the position of respiration. The blood pressure was 102/64 mm Hg, and the heart rate was 73/min. On physical examination, heart sounds are normal on auscultation. His ECG shows sinus rhythm with ST-segment elevation in leads II and III, aVF, and reciprocal segment depression in precordial leads V1–V6. Tissue plasminogen activator therapy is administered to the patient intravenously within 1 hour of arrival at the hospital. After 6 hours of therapy, the patient’s clinical condition starts to deteriorate. An ECG now shows ventricular fibrillation. The patient dies, despite all the efforts made in the intensive care unit. What is the most likely pathological finding to be expected in his heart muscles on autopsy?
A. Coagulative necrosis (Correct Answer)
B. Fat necrosis
C. Caseous necrosis
D. Fibrinoid necrosis
E. Liquefactive necrosis
Explanation: ***Coagulative necrosis***
- This is the most common type of necrosis seen after an **ischemic injury**, such as a **myocardial infarction** (heart attack).
- The cell outlines are preserved, but the intracellular structures are lost, giving a "ghostly" appearance due to protein denaturation.
*Fat necrosis*
- This type of necrosis typically occurs in **adipose tissue** and is characterized by the enzymatic digestion of fats, often seen in **pancreatitis** or trauma to fatty areas.
- It results in chalky white areas due to the formation of calcium soaps and is not characteristic of myocardial infarction.
*Caseous necrosis*
- This is a distinctive form of coagulative necrosis, commonly associated with **tuberculosis** and other granulomatous diseases.
- It describes a cheese-like appearance due to the fragmented and lysed cells and is not found in cardiac muscle after an acute MI.
*Fibrinoid necrosis*
- This is typically seen in **immune reactions** involving blood vessels, where immune complexes and fibrin are deposited in arterial walls.
- It is not the primary type of necrosis observed in myocardial tissue following an acute ischemic event.
*Liquefactive necrosis*
- This occurs when enzymatic digestion of dead cells is prominent, resulting in a **liquid viscous mass**, commonly seen in **brain infarcts** or bacterial infections.
- In the heart, liquefactive necrosis is not the initial or primary type of cell death after ischemia.
Question 40: A 59-year-old presents with right-sided hemiparesis, right-sided sensory loss, leftward eye deviation, and slurred speech. A head CT is performed which is significant for a hyperdense lesion affecting the putamen. The patient has a history of hypertension treated with hydrochlorothiazide, but is non-adherent. Which of the following is most likely associated with the cause of this patient’s neurological deficits?
A. Vessel lipohyalinosis and microaneurysm formation (Correct Answer)
B. Predisposed vessel rupture secondary to cortical atrophy
C. Thrombotic development over ruptured atherosclerotic plaque
D. Saccular aneurysm rupture into the subarachnoid space
E. Amyloid deposition in small cortical vessels
Explanation: ***Vessel lipohyalinosis and microaneurysm formation***
- The presentation of **acute hemiparesis**, sensory loss, eye deviation, and slurred speech, coupled with a **hyperdense lesion** in the **putamen** on CT in an non-adherent hypertensive patient, is highly suggestive of a **hypertensive intracerebral hemorrhage**.
- **Chronic uncontrolled hypertension** leads to **lipohyalinosis** (thickening of small vessel walls) and the formation of **Charcot-Bouchard microaneurysms** in deep penetrating arteries, particularly in the basal ganglia (e.g., putamen), thalamus, and pons, which are prone to rupture.
*Predisposed vessel rupture secondary to cortical atrophy*
- **Cortical atrophy** is primarily associated with neurodegenerative diseases like Alzheimer's, but it does not directly predispose to acute, spontaneous vessel rupture in the absence of other risk factors.
- While atrophy can increase the risk of subdural hematomas in trauma due to stretched bridging veins, it is not the typical mechanism for **intracerebral hemorrhage** in deep brain structures.
*Thrombotic development over ruptured atherosclerotic plaque*
- This mechanism describes an **ischemic stroke**, where a thrombus forms on an atherosclerotic plaque, leading to vessel occlusion and tissue infarction.
- The CT finding of a **hyperdense lesion** points to hemorrhage (bleeding), not an ischemic event.
*Saccular aneurysm rupture into the subarachnoid space*
- Rupture of a **saccular (berry) aneurysm** typically causes a **subarachnoid hemorrhage**, presenting with a sudden, severe "thunderclap" headache, meningism, and altered consciousness.
- While a hyperdense lesion would be seen on CT, the location (often diffusely in the subarachnoid space, not primarily within the putamen) and the specific symptom constellation of focal neurological deficits without severe headache are less typical for this scenario.
*Amyloid deposition in small cortical vessels*
- **Cerebral amyloid angiopathy (CAA)** involves amyloid deposition in small-to-medium-sized cerebral arteries, primarily in the **cortex** and **leptomeninges**, leading to lobar hemorrhages, not typically deep ganglionic hemorrhages.
- CAA is more common in older individuals and can cause recurrent lobar hemorrhages, but the putaminal location strongly favors **hypertensive hemorrhage**.
