Functional Correlations in Clinical Practice — MCQs
In a patient with acute cholecystitis, referred pain to the shoulder is known as
What is the best imaging modality for detecting early osteomyelitis?
A 30-year-old pregnant woman presents with tingling pain and numbness at the tips of her thumb, index finger, and middle finger following trauma. On examination, when the doctor presses between the wrist joints for 30 seconds, the patient develops increased pain at the tips of the middle, index finger, and thumb. What is the diagnosis?
Pointing index finger is seen in which nerve injury
Which of the following structures is pathognomonic for chromoblastomycosis?
Which of the following is NOT a characteristic of accessory nerve palsy?
Ulnar nerve injury results in:
In bladder injury, which of the following is the least likely site of referred pain?
A 12-year-old boy presents with weak pulses in the upper limbs, a blood pressure of 90/60 mmHg , and retinal hemorrhages. What is the most likely diagnosis?
Which of the following conditions is least likely to present with polyarticular involvement in clinical practice?
Functional Correlations in Clinical Practice Indian Medical PG Practice Questions and MCQs
Question 1: In a patient with acute cholecystitis, referred pain to the shoulder is known as
- A. Murphy's sign
- B. Gray Turner sign
- C. Boas' sign (Correct Answer)
- D. Cullen's sign
Explanation: ***Boas' sign*** - **Boas' sign** refers to the presence of hyperesthesia below the right scapula, which can also manifest as referred pain to the **right shoulder** or back [1]. - This symptom in acute cholecystitis is due to the **irritation** of the **phrenic nerve**, which shares sensory pathways with the shoulder region. *Murphy's sign* - **Murphy's sign** is elicited by asking the patient to exhale, then placing the examiner's hand below the costal margin on the right mid-clavicular line, and then asking the patient to inhale deeply [1]. - A positive sign is indicated by a sudden cessation of inspiration due to pain, which is specific for **acute cholecystitis** and not referred shoulder pain [1]. *Gray Turner sign* - The **Gray Turner sign** involves ecchymosis or discoloration of the flanks. - It is a severe indicator of **retroperitoneal hemorrhage**, often associated with acute pancreatitis, not cholecystitis [2]. *Cullen's sign* - **Cullen's sign** presents as periumbilical ecchymosis or discoloration around the navel. - This sign is also indicative of **retroperitoneal hemorrhage**, typically seen in serious conditions like ruptured ectopic pregnancy or acute pancreatitis.
Question 2: What is the best imaging modality for detecting early osteomyelitis?
- A. CT scan
- B. X-ray
- C. MRI (Correct Answer)
- D. Bone scintigraphy
Explanation: ***MRI*** - **Magnetic Resonance Imaging (MRI)** is considered the **gold standard** for detecting early osteomyelitis due to its excellent soft tissue contrast and ability to visualize **bone marrow edema**, which is an early sign of infection. - It can identify changes within **3-5 days** of infection onset, much earlier than other modalities. *CT scan* - While useful for showing **bone destruction**, cortical integrity, and sequestra, **CT scans** are less sensitive than MRI for detecting early marrow edema. - Its ability to diagnose osteomyelitis is usually delayed until significant **bony changes** have occurred, typically around 1-2 weeks. *X-ray* - **Plain radiographs** are often the initial imaging study but are **insensitive** for early osteomyelitis, showing changes only after 10-14 days or more. - Early findings on X-rays can be subtle, such as **periosteal elevation** or **soft tissue swelling**, but frank bone destruction is a late finding. *Bone scintigraphy* - **Bone scintigraphy** (e.g., technetium-99m) is sensitive for detecting increased bone turnover associated with infection but lacks **specificity**, as it can be positive in other conditions like trauma or tumors. - While it can detect changes earlier than X-rays, typically within 2-3 days, it cannot clearly differentiate infection from other processes, and its spatial resolution is poor compared to MRI.
Question 3: A 30-year-old pregnant woman presents with tingling pain and numbness at the tips of her thumb, index finger, and middle finger following trauma. On examination, when the doctor presses between the wrist joints for 30 seconds, the patient develops increased pain at the tips of the middle, index finger, and thumb. What is the diagnosis?
- A. Pronator syndrome
- B. Carpal tunnel syndrome (Correct Answer)
- C. Tarsal tunnel syndrome
- D. Cubital tunnel syndrome
Explanation: **_Carpal tunnel syndrome_** * The symptoms of tingling, pain, and numbness in the thumb, index, and middle fingers are classic for **median nerve compression**, which occurs in the carpal tunnel [1]. * The positive **Phalen's sign** (phalen's test), indicated by increased pain with wrist flexion, also known as pressing between the wrist joints, further supports this diagnosis. * *Pronator syndrome* * Pronator syndrome involves compression of the **median nerve** by the pronator teres muscle, typically causing pain in the proximal forearm and less distinct finger numbness. * While it affects the median nerve, the pain distribution and positive maneuver described are more characteristic of **carpal tunnel syndrome** [1]. * *Tarsal tunnel syndrome* * **Tarsal tunnel syndrome** involves compression of the **posterior tibial nerve** in the ankle, leading to symptoms in the foot and toes, not the hand. * The location of symptoms (thumb, index, and middle fingers) rules out this diagnosis. * *Cubital tunnel syndrome* * **Cubital tunnel syndrome** results from compression of the **ulnar nerve** at the elbow, causing tingling and numbness in the ring and pinky fingers. * The affected fingers (thumb, index, and middle) are innervated by the median nerve, differentiating it from cubital tunnel syndrome.
Question 4: Pointing index finger is seen in which nerve injury
- A. Axillary
- B. Radial
- C. Ulnar
- D. Median (Correct Answer)
Explanation: ***Median*** - The **pointing index finger** sign occurs in **proximal median nerve injury** when attempting to make a fist, as the median nerve supplies **flexor digitorum superficialis (FDS)** and lateral half of **flexor digitorum profundus (FDP)**. - This creates the classic **"hand of benediction"** or **"pope's blessing"** sign where index and middle fingers remain extended due to loss of flexion capability. *Axillary* - Primarily innervates the **deltoid** and **teres minor muscles**, affecting **shoulder abduction** and external rotation. - Injury does not cause any **finger positioning abnormalities** or hand deformities. *Radial* - Injury causes **"wrist drop"** with inability to extend the wrist, thumb, and fingers at **MCP joints**. - Results in all fingers remaining **flexed due to unopposed flexor action**, not a pointing finger deformity. *Ulnar* - Injury causes **"claw hand"** deformity primarily affecting the **ring and little fingers** (4th and 5th digits). - Creates **hyperextension at MCP joints** and **flexion at PIP/DIP joints**, with the index finger typically less affected.
Question 5: Which of the following structures is pathognomonic for chromoblastomycosis?
- A. Asteroid body
- B. Sclerotic body (Correct Answer)
- C. Budding yeast
- D. Negri body
Explanation: ***Sclerotic body*** - **Sclerotic bodies**, also known as **Medlar bodies** or **fumagoid cells**, are characteristic coin-shaped, thick-walled, septate, dematiaceous structures observed histologically in affected tissues. - Their presence is **pathognomonic** for chromoblastomycosis, a chronic fungal infection of the skin and subcutaneous tissue. *Asteroid body* - **Asteroid bodies** are typically found in **sporotrichosis**, representing an antigen-antibody complex surrounding fungal elements. - They are not characteristic of chromoblastomycosis. *Budding yeast* - **Budding yeast** forms are commonly seen in various fungal infections, such as **candidiasis** or **cryptococcosis**, but are not specific to chromoblastomycosis. [1] - This morphology indicates yeast proliferation but lacks the distinctive sclerotic appearance. *Negri body* - **Negri bodies** are eosinophilic, sharply demarcated neuronal cytoplasmic inclusions found in the diagnostic examination of **rabies** infection. - They are entirely unrelated to fungal infections like chromoblastomycosis. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Lung, p. 717.
Question 6: Which of the following is NOT a characteristic of accessory nerve palsy?
- A. Shoulder drooping
- B. Normal electromyographic finding (Correct Answer)
- C. Pain
- D. Restricted range of movement
Explanation: ***Normal electromyographic finding*** - Accessory nerve palsy affects the function of the **sternocleidomastoid** and **trapezius** muscles. An electromyographic (EMG) study would show **abnormal findings** such as fibrillations, positive sharp waves, and reduced motor unit recruitment in these muscles due to denervation. - Therefore, a finding of a normal EMG would indicate the **absence** of accessory nerve pathology. *Shoulder drooping* - This is a classic characteristic of accessory nerve palsy due to weakness of the **trapezius muscle**, which is responsible for maintaining shoulder posture. - The trapezius muscle helps to elevate and retract the scapula, and its paralysis leads to the **inferior displacement** of the shoulder on the affected side. *Pain* - **Chronic pain** in the neck and shoulder area is a common symptom associated with accessory nerve palsy. - This pain can result from muscle imbalance, spasticity, or compensatory mechanisms by other muscles trying to **overcome the weakness**. *Restricted range of movement* - Weakness of the **trapezius** and **sternocleidomastoid muscles** directly impacts the ability to perform certain movements, such as shrugging the shoulders (trapezius) and turning the head to the opposite side (sternocleidomastoid). - This leads to a **limited ability** to actively elevate the arm above 90 degrees and **difficulty rotating the head** against resistance.
Question 7: Ulnar nerve injury results in:
- A. Pointing index
- B. Ape thumb deformity
- C. Clawing of fingers (Correct Answer)
- D. Wrist drop
Explanation: ***Clawing of fingers*** - An ulnar nerve injury, particularly at the elbow, often leads to **paralysis of the interossei muscles** and the **medial two lumbricals**. [1] - This results in **hyperextension at the metacarpophalangeal joints** and **flexion at the interphalangeal joints** of the 4th and 5th fingers (and sometimes 3rd), creating the characteristic claw hand deformity. [1] *Pointing index* - **Pointing index**, also known as the **sign of benediction** or **preacher's hand**, occurs with **high median nerve lesions** affecting the lateral lumbricals and flexor digitorum superficialis. - The patient is unable to flex the index and middle fingers, especially when attempting to make a fist. *Ape thumb deformity* - **Ape thumb deformity** is caused by a **median nerve injury**, specifically affecting the **thenar muscles** (abductor pollicis brevis, opponens pollicis, and superficial head of flexor pollicis brevis). - This paralysis leads to the thumb being pulled laterally and into the same plane as the other fingers, losing its ability to oppose. *Wrist drop* - **Wrist drop** is a classic sign of **radial nerve injury**, which paralyzes the **extensor muscles of the wrist and fingers**. - This prevents the patient from extending their wrist and metacarpophalangeal joints.
Question 8: In bladder injury, which of the following is the least likely site of referred pain?
- A. Lower abdominal wall
- B. Flank
- C. Penis
- D. Upper part of thigh (Correct Answer)
Explanation: ***Upper part of thigh*** - Pain from bladder injury is typically referred to areas innervated by the **S2-S4 spinal segments**, which supply the perineum, external genitalia, and posterior thigh. - The upper part of the thigh, particularly the anterior or medial aspects, is primarily innervated by the **lumbar plexus (L2-L4)**, making it a less common site for bladder pain referral. *Lower abdominal wall* - The bladder's superior surface peritoneum is innervated by **T11-L2 sympathetic fibers**, allowing for referred pain to the suprapubic and lower abdominal regions. - This is a common pattern for bladder distension or inflammation, as the peritoneum lining the bladder wall can stretch and trigger these fibers. *Flank* - While referred pain to the flank is more typical of **kidney or ureteral pathology**, severe bladder distension or irritation, especially if it irritates surrounding structures or peritoneum, can sometimes cause referred pain in this region. - The sensory innervation from the bladder can overlap with areas that refer to the flank, particularly through the **sympathetic pathways**. *Penis* - The penis receives sensory innervation from the **pudendal nerve (S2-S4)**, which shares spinal segments with the detrusor muscle of the bladder. - This common innervation pathway makes the penis a very likely site for referred pain from bladder injury or irritation, often described as a deep, radiating pain.
Question 9: A 12-year-old boy presents with weak pulses in the upper limbs, a blood pressure of 90/60 mmHg , and retinal hemorrhages. What is the most likely diagnosis?
- A. Henoch-Schönlein purpura (HSP)
- B. Polyarteritis nodosa (PAN)
- C. Takayasu arteritis (Correct Answer)
- D. Microscopic polyangiitis
Explanation: ***Takayasu arteritis*** - **Weak pulses** in the upper limbs, **lower blood pressure** (90/60 mmHg), and **retinal hemorrhages** are classic signs of Takayasu arteritis, which primarily affects the aortic arch and its major branches. [1] - This condition is also known as "pulseless disease" due to the significant narrowing of peripheral arteries, leading to diminished or absent pulses. [1] *Henoch-Schönlein purpura (HSP)* - HSP is characterized by a **palpable purpuric rash**, **arthralgia**, **abdominal pain**, and **renal involvement** (hematuria/proteinuria), none of which are explicitly mentioned here. - It typically affects **small vessels** and does not cause weak pulses in the upper limbs or systemic hypotension in this manner. *Polyarteritis nodosa (PAN)* - PAN is a **necrotizing vasculitis** of medium-sized arteries, often presenting with **fever**, **weight loss**, **myalgia**, and visceral infarcts. - While it can affect various organs, it does not typically cause the specific pattern of weak upper limb pulses and retinal hemorrhages observed here, which points to large vessel involvement. *Microscopic polyangiitis* - This is a **small-vessel vasculitis** characterized by **glomerulonephritis** and **pulmonary capillaritis**, often presenting with hemoptysis and rapidly progressive renal failure. - It does not cause the large vessel symptoms like weak upper limb pulses or significant systemic hypotension seen in the patient.
Question 10: Which of the following conditions is least likely to present with polyarticular involvement in clinical practice?
- A. Psoriatic arthritis
- B. SLE
- C. Gout
- D. Ankylosing spondylitis (Correct Answer)
Explanation: ***SLE*** - Systemic lupus erythematosus (SLE) is a **systemic autoimmune disease** and while it can present with polyarthritis, other systemic features also occur, making it less common in isolation [1]. - It encompasses a broad spectrum of **clinical manifestations**, often leading to multi-organ involvement beyond joint symptoms [1]. *Gout* - Usually triggers **acute inflammatory arthritis**, characterized by sudden and severe pain in a single joint, particularly the big toe [2]. - It is significantly common and frequently treated in clinical practice. *Ankylosing spondylitis* - Primarily affects the spine and sacroiliac joints, causing stiffness and is quite an **identifiable form of inflammatory arthritis** [3]. - It has a notable association with **HLA-B27** and can present with back pain, making it relatively common among spondyloarthropathies [3]. *Psoriatic arthritis* - Associated with **psoriasis**, this form of arthritis can occur and is known for **asymmetrical polyarthritis** and dactylitis [4]. - It is a recognized inflammatory condition that leads to joint destruction and is increasingly prevalent among patients with skin involvement [4].
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