Colorectal cancer — MCQs
A 64-year-old man presents with progressive memory loss, gait instability, and urinary incontinence. MRI shows ventricular dilatation. CSF opening pressure is 12 cmH₂O. What is the most appropriate treatment?
A 34-year-old man presents with acute onset severe testicular pain. Examination shows a high-riding, horizontally oriented testicle. Doppler ultrasound appears normal. What is the most appropriate management?
A 29-year-old man presents with acute onset severe testicular pain 6 hours ago. Clinical examination suggests torsion but Doppler ultrasound shows preserved blood flow. What is the most appropriate management?
A 58-year-old diabetic man presents with fever and a swollen, red foot. X-ray shows gas in soft tissues. Blood glucose is 25 mmol/L. What is the most appropriate immediate management?
A 31-year-old man presents with acute severe scrotal pain and swelling that began 3 hours ago. The testicle is high-riding and horizontal. Cremasteric reflex is absent. What is the most appropriate management?
A 63-year-old man presents with progressive memory loss and gait instability. He has urinary incontinence. MRI shows enlarged ventricles with normal cortical sulci. What is the most appropriate treatment?
A 31-year-old man presents with acute severe testicular pain. The pain started suddenly⁴ hours ago. Doppler ultrasound shows absent blood flow. What is the salvage rate if specified?
A 52-year-old diabetic man presents with a non-healing foot ulcer. ABPI is 0.4. What is the most appropriate management?
A 63-year-old man presents with progressive memory loss and gait disturbance. MRI shows ventricular dilatation. Large-volume lumbar puncture temporarily improves his walking. What is the most appropriate treatment?
A 37-year-old man presents with sudden severe chest pain radiating to his back. CT angiogram shows Stanford type A aortic dissection. What is the most appropriate management?
Colorectal cancer UK Medical PG Practice Questions and MCQs
Question 1: A 64-year-old man presents with progressive memory loss, gait instability, and urinary incontinence. MRI shows ventricular dilatation. CSF opening pressure is 12 cmH₂O. What is the most appropriate treatment?
- A. Acetazolamide
- B. Repeated lumbar punctures
- C. Ventriculoperitoneal shunt (Correct Answer)
- D. Endoscopic third ventriculostomy
- E. No specific treatment
Explanation: ***Ventriculoperitoneal shunt***- The classic triad of **memory loss**, **gait instability**, and **urinary incontinence** with **ventricular dilatation** and **normal CSF pressure** (12 cmH₂O) is highly suggestive of **Normal Pressure Hydrocephalus (NPH)**.- **Ventriculoperitoneal (VP) shunting** is the definitive treatment for NPH, diverting excess CSF to improve symptoms by relieving pressure on the brain.*Acetazolamide*- **Acetazolamide** is a **carbonic anhydrase inhibitor** that reduces CSF production, primarily used for conditions like **idiopathic intracranial hypertension (IIH)**.- It is generally **ineffective** for NPH because the primary problem is impaired CSF absorption, not overproduction.*Repeated lumbar punctures*- The **large-volume lumbar puncture (LP) tap test** is a diagnostic tool for NPH to assess potential shunt response, but it is not a long-term treatment.- The benefits of repeated LPs for NPH are often **transient**, and it's not a sustainable or definitive therapy.*Endoscopic third ventriculostomy*- **Endoscopic third ventriculostomy (ETV)** is typically performed for **obstructive (non-communicating) hydrocephalus** where there's a blockage in CSF flow within the ventricular system.- NPH is a form of **communicating hydrocephalus**, meaning CSF flows freely between ventricles and the subarachnoid space, making ETV an **inappropriate procedure**.*No specific treatment*- NPH is a **treatable cause of dementia**; the symptoms are progressive and significantly impact quality of life if left untreated.- Given the clear clinical presentation, imaging, and CSF findings consistent with NPH, active intervention with a **VP shunt** is highly indicated.
Question 2: A 34-year-old man presents with acute onset severe testicular pain. Examination shows a high-riding, horizontally oriented testicle. Doppler ultrasound appears normal. What is the most appropriate management?
- A. Discharge with follow-up
- B. Antibiotics for epididymitis
- C. Urgent surgical exploration (Correct Answer)
- D. Repeat ultrasound in 6 hours
- E. Conservative management
Explanation: ***Urgent surgical exploration***- The clinical presentation of acute onset severe testicular pain, a **high-riding testicle**, and a **horizontal lie** are classic signs of **testicular torsion**, a surgical emergency.- Despite a normal Doppler ultrasound (which can be a false negative), **clinical suspicion** for torsion mandates immediate **surgical exploration** to prevent irreversible **testicular necrosis**. *Discharge with follow-up*- Acute, severe testicular pain with findings suggestive of torsion is a time-sensitive emergency requiring immediate intervention, not delayed follow-up.- Discharging the patient risks prolonged **ischemia**, leading to loss of the testicle. *Antibiotics for epididymitis*- While epididymitis is a differential, its onset is typically more **gradual**, and physical examination usually reveals tenderness of the epididymis, often with a **positive Prehn's sign**.- The sudden onset and classic signs of a high-riding, horizontal testicle strongly point towards torsion rather than epididymitis. *Repeat ultrasound in 6 hours*- Testicular viability is critically time-dependent, rapidly decreasing after **4-6 hours** of complete torsion, making a 6-hour delay for repeat imaging unacceptable.- Delaying definitive intervention to repeat imaging significantly increases the risk of irreversible **testicular damage** and loss. *Conservative management*- Testicular torsion requires immediate surgical **detorsion and orchidopexy** to restore blood flow and fix the testicle to prevent recurrence.- Conservative management will inevitably lead to **testicular infarction** and necessitate an **orchiectomy** (removal of the testicle).
Question 3: A 29-year-old man presents with acute onset severe testicular pain 6 hours ago. Clinical examination suggests torsion but Doppler ultrasound shows preserved blood flow. What is the most appropriate management?
- A. Reassurance and discharge
- B. Antibiotics for epididymitis
- C. Urgent surgical exploration (Correct Answer)
- D. Repeat ultrasound in 24 hours
- E. Pain relief only
Explanation: ***Urgent surgical exploration***- **Clinical suspicion of testicular torsion** (acute onset, severe pain, 6 hours duration) is a surgical emergency; imaging findings must be interpreted cautiously, and **exploration** is warranted when suspicion is high, as the window for **testicular salvage** is narrow (ideally <6 hours).- **Doppler ultrasound showing preserved blood flow** can be misleading in partial torsion or early stages, where inadequate perfusion still leads to ischemia; **surgical exploration** is the definitive method to confirm or rule out torsion and prevent **testicular necrosis**.*Reassurance and discharge*- Severe, acute testicular pain requires immediate and thorough evaluation to exclude **testicular torsion**, a time-sensitive emergency; simple discharge is inappropriate and delays critical intervention.- This approach risks **testicular loss** due to unaddressed ischemia and is medically negligent.*Antibiotics for epididymitis*- While epididymitis is a differential, it typically presents with a more **gradual onset** of pain, often accompanied by local inflammation or urinary symptoms, which are not clearly indicated here.- Administering antibiotics delays the necessary **surgical intervention** for torsion, which could lead to irreversible **testicular damage**.*Repeat ultrasound in 24 hours*- Testicular torsion is a time-critical condition; delaying diagnosis and intervention for 24 hours would almost certainly result in **testicular non-viability** due to prolonged ischemia.- The priority is rapid **diagnosis and management** to preserve the testis, not delayed re-evaluation of equivocal findings.*Pain relief only*- Providing pain relief addresses symptoms but fails to treat the underlying cause, which could be a **surgical emergency** like testicular torsion.- Masking pain without definitive diagnosis and intervention risks progression to **testicular infarction** and loss.
Question 4: A 58-year-old diabetic man presents with fever and a swollen, red foot. X-ray shows gas in soft tissues. Blood glucose is 25 mmol/L. What is the most appropriate immediate management?
- A. Oral antibiotics
- B. IV antibiotics alone
- C. Urgent surgical debridement (Correct Answer)
- D. Hyperbaric oxygen
- E. Amputation
Explanation: ***Urgent surgical debridement*** - The presence of **gas in soft tissues** on X-ray, combined with fever and a swollen, red foot in a **diabetic patient**, indicates a **necrotizing soft tissue infection** (e.g., necrotizing fasciitis or gas gangrene). - **Urgent surgical debridement** is the most critical immediate intervention to remove necrotic tissue and prevent rapid spread of the infection, which is vital for patient survival. *Oral antibiotics* - Oral antibiotics are **inadequate** for a severe, rapidly progressing infection like a necrotizing soft tissue infection. - Relying on oral antibiotics would lead to dangerous delays in appropriate and aggressive treatment, increasing morbidity and mortality. *IV antibiotics alone* - While **broad-spectrum intravenous antibiotics** are a crucial component of treatment, they are **insufficient as monotherapy** for necrotizing soft tissue infections. - The infection requires **source control** through surgical removal of devitalized tissue, which antibiotics alone cannot achieve. *Hyperbaric oxygen* - **Hyperbaric oxygen therapy** can be an **adjunctive treatment** for certain severe infections, particularly clostridial myonecrosis (gas gangrene). - However, it is **not the immediate primary management**; **surgical debridement** is paramount and should not be delayed for hyperbaric oxygen. *Amputation* - **Amputation** is a **definitive measure** reserved for cases of overwhelming, irreversible tissue destruction or uncontrolled infection despite aggressive surgical and medical management. - It is **premature** as the immediate initial management; the goal is to perform debridement to control the infection and attempt limb salvage first.
Question 5: A 31-year-old man presents with acute severe scrotal pain and swelling that began 3 hours ago. The testicle is high-riding and horizontal. Cremasteric reflex is absent. What is the most appropriate management?
- A. Doppler ultrasound first
- B. Immediate surgical exploration (Correct Answer)
- C. Antibiotics and analgesia
- D. Ice and elevation
- E. Urine analysis
Explanation: ***Immediate surgical exploration***- The clinical presentation (acute, severe pain, **high-riding testicle**, and absent **cremasteric reflex**) is highly suggestive of **testicular torsion**, which is a surgical emergency.- Given the critical time window (ideally < 6 hours) required to salvage the testicle, the management should proceed directly to exploration without delaying for imaging.*Doppler ultrasound first*- While a **Doppler ultrasound** showing absent intratesticular blood flow confirms the diagnosis, it should only be used if the diagnosis is ambiguous or when surgical facilities are not immediately available.- When clinical signs are classic for torsion, performing imaging first delays definitive treatment and significantly increases the risk of **testicular infarction**.*Antibiotics and analgesia*- This approach is the primary management for **epididymitis**, which typically presents with a more gradual onset of pain, associated lower urinary tract symptoms, and an *intact* cremasteric reflex (often positive **Prehn's sign**).- Torsion is an ischemic process, and antibiotics are not the definitive treatment; surgical detorsion is mandatory.*Ice and elevation*- Using **ice and elevation** is a conservative measure primarily used to reduce swelling and pain associated with trauma or inflammation (like epididymitis) but does not reverse the torsion itself.- Relying on supportive measures alone delays necessary surgical intervention, leading to immediate tissue death.*Urine analysis*- A **urine analysis** is useful for diagnosing infectious causes of scrotal pain, such as **epididymitis** or **orchitis**, where it may reveal pyuria or bacteriuria.- Since the clinical picture is classic for torsion (a mechanical/ischemic emergency), waiting for urine results is inappropriate and delays time-sensitive intervention.
Question 6: A 63-year-old man presents with progressive memory loss and gait instability. He has urinary incontinence. MRI shows enlarged ventricles with normal cortical sulci. What is the most appropriate treatment?
- A. Cholinesterase inhibitors
- B. Ventriculoperitoneal shunt (Correct Answer)
- C. Lumbar puncture
- D. Corticosteroids
- E. Carbidopa/levodopa
Explanation: ***Ventriculoperitoneal shunt***- The triad of **progressive memory loss** (dementia), **gait instability**, and **urinary incontinence**, coupled with MRI showing **enlarged ventricles** and **normal cortical sulci**, is highly characteristic of **Normal Pressure Hydrocephalus (NPH)**.- A **ventriculoperitoneal (VP) shunt** is the definitive treatment for NPH, diverting excess cerebrospinal fluid (CSF) to alleviate symptoms, particularly gait and urinary control. *Cholinesterase inhibitors*- These medications are primarily used to treat cognitive symptoms in **Alzheimer's disease** and other forms of dementia stemming from neurodegeneration. - NPH is a distinct condition involving CSF dynamics, and these inhibitors are not effective for its underlying pathology or the specific triad of symptoms.*Lumbar puncture*- A **high-volume lumbar puncture** (LP) can be used as a **diagnostic test** for NPH to assess if symptoms, especially gait, temporarily improve after CSF removal, indicating potential shunt responsiveness. - While it offers temporary relief and aids diagnosis, it is not a long-term treatment and requires surgical intervention for definitive management.*Corticosteroids*- **Corticosteroids** are anti-inflammatory agents used to treat conditions like cerebral edema, autoimmune disorders, or inflammation affecting the central nervous system. - They have no therapeutic role in **Normal Pressure Hydrocephalus**, which is a disorder of CSF circulation and absorption, not primarily inflammation.*Carbidopa/levodopa*- This combination is the cornerstone treatment for **Parkinson's disease**, addressing its motor symptoms like bradykinesia, rigidity, and tremor. - While gait instability can be present in both NPH and Parkinson's, the accompanying **dementia** and **urinary incontinence**, along with the characteristic MRI findings, differentiate NPH from Parkinson's disease.
Question 7: A 31-year-old man presents with acute severe testicular pain. The pain started suddenly⁴ hours ago. Doppler ultrasound shows absent blood flow. What is the salvage rate if specified?
- A. >95%
- B. 80-90% (Correct Answer)
- C. 60-70%
- D. 40-50%
- E. <20%
Explanation: ***80-90%*** - **4 hours** of **testicular torsion** places the patient in a window where the testis is still highly viable, but the rate decreases rapidly after 3 hours due to accumulating **ischemic damage**. - Salvage rates are generally cited as **80-90%** for ischemia lasting between **4 and 8 hours**, indicating a good, but not perfect, chance of testicular viability. * >95%* - This near-perfect salvage rate applies almost exclusively to surgical detorsion performed within the initial **0-3 hours** of symptom onset. - After 4 hours, sufficient irreversible cellular damage, especially to the **germ cells** of the **seminiferous tubules**, usually lowers the overall viability percentage below 95%. *60-70%* - This lower salvage rate is characteristic of torsion lasting between **8 and 12 hours**, where more extensive **irreversible injury** has occurred. - Viability drops further in this window as prolonged ischemia leads to widespread **testicular necrosis**. *40-50%* - This range indicates severe compromise and is associated primarily with presentation times between **12 and 24 hours** from the beginning of acute pain. - When viability is this low, even if the testis is salvaged, resulting **testicular atrophy** is highly probable. * <20%* - This represents a very poor prognosis and is usually seen when **ischemia** has persisted for more than **24 hours**. - At this stage, the testis is typically non-viable, making surgical **orchiectomy** the standard treatment.
Question 8: A 52-year-old diabetic man presents with a non-healing foot ulcer. ABPI is 0.4. What is the most appropriate management?
- A. Antibiotics alone
- B. Wound care only
- C. Vascular surgery referral (Correct Answer)
- D. Amputation
- E. Hyperbaric oxygen
Explanation: ***Vascular surgery referral***- An **ABPI of 0.4** signifies **severe peripheral arterial disease (PAD)**, often corresponding to **critical limb ischemia (CLI)**, which requires urgent specialist evaluation for revascularization.- The primary objective is to restore adequate blood flow (perfusion) via procedures like **angioplasty** or **bypass surgery** to enable ulcer healing and prevent major limb loss.*Antibiotics alone*- While infection management is crucial, **antibiotics** cannot correct the underlying **ischemia** caused by the severe arterial blockage (ABPI 0.4).- Without improved blood flow, systemic or topical antibiotics will fail to reach effective concentrations in the poorly perfused tissue, rendering the treatment ineffective for healing.*Wound care only*- Basic **wound care** (dressing, debridement) is necessary but will be ineffective as the sole treatment because healing requires sufficient **oxygen and nutrients**, which are severely compromised at this low ABPI.- Focusing purely on local care without addressing the severe **macrovascular disease** will almost guarantee progression to **necrosis** and subsequent amputation.*Amputation*- **Amputation** is a procedure of necessity, usually reserved for cases where revascularization has failed or when there is overwhelming infection or non-salvageable tissue destruction (wet gangrene).- The patient must first be assessed for potential limb salvage through **revascularization** before proceeding directly to amputation.*Hyperbaric oxygen*- **Hyperbaric oxygen therapy (HBOT)** is an adjunctive treatment that may aid wound healing by increasing tissue oxygenation, but it is not the definitive treatment for structural arterial occlusion.- HBOT is typically applied after **revascularization** has been attempted but is insufficient as the primary management for severe PAD (ABPI 0.4).
Question 9: A 63-year-old man presents with progressive memory loss and gait disturbance. MRI shows ventricular dilatation. Large-volume lumbar puncture temporarily improves his walking. What is the most appropriate treatment?
- A. Cholinesterase inhibitors
- B. Ventriculoperitoneal shunt (Correct Answer)
- C. Repeated lumbar punctures
- D. Corticosteroids
- E. Observation
Explanation: ***Ventriculoperitoneal shunt***- This is the definitive treatment for symptomatic **Normal Pressure Hydrocephalus (NPH)**, especially after the large-volume lumbar puncture confirms responsiveness.- The **VP shunt** diverts excess cerebrospinal fluid (**CSF**) from the cerebral ventricles into the peritoneal cavity, relieving pressure and potentially reversing the classic triad of gait imbalance, dementia, and urinary incontinence.*Cholinesterase inhibitors*- These medications are the mainstay treatment for **Alzheimer's disease** and other neurodegenerative dementias, intended to boost cholinergic function.- Cholinesterase inhibitors do not address the underlying **CSF dynamics** or ventricular enlargement seen in NPH, rendering them ineffective.*Repeated lumbar punctures*- While a large-volume LP proves reversibility and is part of the diagnostic process, repeated LPs are a temporary and impractical solution for ongoing **CSF drainage**.- This approach carries risks (e.g., infection, post-LP headache) and does not provide the **continuous CSF diversion** required for long-term symptom control in NPH.*Corticosteroids*- **Corticosteroids** are used primarily for conditions involving inflammation, autoimmune processes, or significant brain edema and swelling.- They are not effective because NPH is a mechanistic problem involving impaired **CSF absorption** rather than an inflammatory disorder.*Observation*- **Observation** is inappropriate because NPH is a progressive and treatable condition, unlike most other causes of dementia.- Following confirmation of responsiveness via the LP, timely surgical intervention is necessary to prevent continued and potentially irreversible **neurological deterioration**.
Question 10: A 37-year-old man presents with sudden severe chest pain radiating to his back. CT angiogram shows Stanford type A aortic dissection. What is the most appropriate management?
- A. Medical management
- B. Emergency surgical repair (Correct Answer)
- C. Endovascular stent graft
- D. Thrombolysis
- E. Observation
Explanation: ***Emergency surgical repair***: - **Stanford Type A aortic dissection** involves the ascending aorta and is a life-threatening emergency requiring immediate open surgery to prevent rupture, acute **aortic regurgitation**, and organ malperfusion. - The surgery typically involves replacing the dissected segment of the ascending aorta and often addressing the aortic valve or root if necessary. *Medical management*: - This is the primary treatment strategy for **uncomplicated Stanford Type B dissections** (involving only the descending aorta), aiming to strictly control blood pressure and heart rate. - While initial medical stabilization (e.g., pain control, beta-blockade) is critical for all dissections, it is insufficient as definitive treatment for the high-risk Type A dissection. *Endovascular stent graft*: - Endovascular repair (**TEVAR**) is the preferred treatment for complicated or symptomatic **Stanford Type B dissections**. - It is generally avoided in Type A dissection because the involvement of the aortic arch and root often necessitates open manipulation to replace the segment and repair the valve. *Thrombolysis*: - Thrombolysis is used for acute thromboembolic conditions (like **STEMI** or massive pulmonary embolism) and breaks down blood clots. - It is strictly **contraindicated** in aortic dissection, as activation of the coagulation cascade would worsen the dissection, leading to rapid exsanguination and death. *Observation*: - Observation is never appropriate for an acute **Stanford Type A dissection** due to the extremely high and rapidly rising risk of mortality (1-2% per hour). - Immediate intervention, either surgical or endovascular depending on the type, is mandatory.
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