- Which examination finding would BEST confirm the suspected diagnosis?
Answer: Upbeating and torsional nystagmus during the Dix-Hallpike test to the right.
The correct answer is upbeating and torsional nystagmus during the Dix-Hallpike test to the right. The patient's history is classic for posterior canal Benign Paroxysmal Positional Vertigo (BPPV). The brief, intense episodes of vertigo are triggered by specific head position changes relative to gravity. The Dix-Hallpike test is the gold standard diagnostic maneuver for posterior canal BPPV, and a positive test on the right will provoke her vertigo and a characteristic upbeating and torsional nystagmus.
(A) Spontaneous nystagmus present with fixation is a red flag for a central pathology, not BPPV. In peripheral conditions like BPPV, any nystagmus is typically suppressed by visual fixation.
(B) A positive head-thrust test indicates a vestibulo-ocular reflex (VOR) deficit, which is characteristic of a peripheral hypofunction, such as in vestibular neuritis. The patient's history is not consistent with vestibular neuritis, which typically involves a single, prolonged episode of severe vertigo, nausea, and imbalance.
(D) Fluctuating sensorineural hearing loss, along with tinnitus and aural fullness, is a hallmark of Meniere's disease. Meniere's attacks of vertigo are typically spontaneous and last for hours, not seconds, and are not provoked by position changes.
- This constellation of signs and symptoms is MOST indicative of which of the following conditions?
Answer: Complex regional pain syndrome (CRPS)
The correct answer is Complex regional pain syndrome (CRPS). The presentation aligns with the Budapest criteria for CRPS: a continuing pain disproportionate to the inciting event, reported symptoms across several categories (sensory: allodynia; vasomotor: skin color changes; sudomotor/edema: swelling; motor/trophic: motor dysfunction, trophic changes like shiny skin), and observable signs in those categories. The timeline following trauma is also classic for CRPS Type I.
(A) Factitious disorder involves the intentional falsification of symptoms for the purpose of assuming the sick role. While the patient's distress is high, the objective physical findings (swelling, skin color changes, shiny skin) make a purely psychogenic origin unlikely. CRPS involves real, measurable pathophysiological changes.
(C) A nerve impingement from a healing fracture could cause pain and sensory changes, but it would not typically explain the vasomotor (color changes), sudomotor (swelling), and trophic (shiny skin) changes affecting the entire hand in a non-dermatomal pattern.
(D) Raynaud's phenomenon is a vascular disorder characterized by episodic vasospasm of the digits in response to cold or stress, leading to well-demarcated color changes (white, blue, red). It does not cause the constant burning pain, allodynia, or edema described in this case.
- The patient's left shoulder pain is MOST likely an example of referred pain from an injury to which organ?
Answer: Spleen
The correct answer is the Spleen. The presentation of left shoulder pain following trauma to the left upper quadrant is a classic presentation of Kehr's sign. This referred pain occurs when blood from a ruptured spleen irritates the diaphragm and the phrenic nerve (C3-C5 nerve roots), which shares innervation with the shoulder region. This is a medical emergency requiring immediate referral.
(A) While irritation of the diaphragm is the mechanism for Kehr's sign, the underlying injury in this trauma context is most likely to the spleen, which then bleeds and irritates the diaphragm. The spleen is the primary injured organ.
(B) Pain from the stomach is typically referred to the epigastric area or the upper back between the scapulae, not the shoulder tip.
(D) Pain from the left kidney is typically referred to the left flank, lower back, or groin, not the shoulder tip.
- The patient's pattern of fluctuating, activity-induced weakness is MOST characteristic of which neuromuscular disorder?
Answer: Myasthenia gravis (MG)
The correct answer is Myasthenia gravis (MG). This is a classic presentation of MG, an autoimmune disorder affecting the neuromuscular junction. The hallmark feature is fatigable weakness of skeletal muscles, which worsens with repetitive use and improves with rest. The predilection for ocular (ptosis, diplopia) and bulbar (dysarthria, dysphagia) muscles is highly characteristic. The provocation of ptosis with sustained upgaze is a common clinical test for MG.
(A) Lambert-Eaton myasthenic syndrome (LEMS) is another neuromuscular junction disorder, but it is characterized by weakness that improves with brief exercise before fatiguing. It also typically affects proximal limb muscles more than ocular and bulbar muscles, and is often associated with small-cell lung cancer.
(C) Polymyositis is an inflammatory myopathy that causes symmetric, proximal muscle weakness that is constant and does not fluctuate significantly with rest or activity in the same way as MG. Ocular muscle involvement is rare.
(D) Amyotrophic lateral sclerosis (ALS) is a progressive neurodegenerative disease causing muscle weakness, but the weakness is due to motor neuron death and does not improve with rest. ALS involves a combination of upper and lower motor neuron signs, rather than the isolated fatigable weakness seen here.
- Which diagnosis BEST explains this patient's clinical presentation?
Answer: Gluteal tendinopathy
The correct answer is Gluteal tendinopathy. This condition, often part of 'greater trochanteric pain syndrome,' is the most common cause of lateral hip pain. The presentation of point tenderness over the greater trochanter, pain with side-lying, and pain/weakness with resisted hip abduction is classic. The positive single-leg stance test reproducing lateral hip pain is also highly indicative of abductor tendon pathology (gluteus medius/minimus). The patient's history as a runner is a common risk factor.
(A) Iliotibial (IT) band syndrome typically causes pain at the lateral femoral epicondyle near the knee, not the greater trochanter. While the Ober's test may be positive, the primary pain location is different.
(B) L4-L5 radiculopathy can cause lateral thigh pain, but it would typically be associated with neurological signs such as altered sensation, changes in reflexes, and a positive straight leg raise or slump test. Pain would also likely be reproduced with lumbar spine movements.
(D) Ischiofemoral impingement causes posterior hip/buttock pain due to compression of the quadratus femoris muscle between the ischial tuberosity and the lesser trochanter. Pain is usually provoked by combined hip extension, adduction, and external rotation, not abduction.
- The patient's signs and symptoms are MOST consistent with which of the following conditions?
Answer: Acute pericarditis
The correct answer is Acute pericarditis. The classic presentation includes sharp, pleuritic chest pain that is relieved by sitting up and leaning forward and worsened by lying supine. The presence of a pericardial friction rub on auscultation is pathognomonic. The diffuse ST elevation on ECG is also a hallmark finding for pericarditis, differentiating it from the localized ST elevation with reciprocal depression seen in MI.
(A) Acute myocardial infarction pain is typically described as a pressure or squeezing sensation, often radiates to the arm/jaw, and is not significantly affected by position or respiration. While ECG can show ST elevation, it is typically localized to specific leads with reciprocal changes.
(B) Costochondritis causes chest wall pain that is reproducible with palpation of the costosternal joints. It would not cause a friction rub, ECG changes, or elevated cardiac enzymes.
(D) A pulmonary embolism can cause pleuritic chest pain, but it is usually accompanied by dyspnea and tachycardia. The classic positional relief by leaning forward is not a feature of PE, and the ECG and auscultation findings are not typical for PE.
- The patient's acute change in status is MOST concerning for which of the following postoperative complications?
Answer: Pulmonary embolism (PE)
The correct answer is Pulmonary embolism (PE). The triad of acute onset dyspnea, pleuritic chest pain, and tachycardia in a high-risk postoperative patient is highly suggestive of a PE. His hypoxia (SpO2 91%) further supports this diagnosis. Immobility and recent major surgery are significant risk factors. This is a life-threatening condition requiring immediate medical attention.
(A) Sternal wound dehiscence would present with pain, clicking, or instability at the sternotomy site, but it would not typically cause acute dyspnea, tachycardia, and hypoxia.
(B) Atelectasis is a very common post-op complication and can cause decreased breath sounds and a low-grade fever. However, it does not usually cause acute, sharp chest pain and significant tachycardia and hypoxia of this magnitude.
(D) Pneumonia is also a risk, but its onset is typically more gradual and is almost always accompanied by a productive cough and fever. The sudden, acute nature of this patient's symptoms makes PE a more likely and urgent diagnosis.
- Given this patient's presentation and lab findings, what is the MOST likely diagnosis?
Answer: Polymyalgia rheumatica (PMR)
The correct answer is Polymyalgia rheumatica (PMR). This systemic inflammatory condition is characterized by age over 50, bilateral shoulder and/or hip girdle pain, significant morning stiffness (>45 min), constitutional symptoms (malaise, fatigue, fever), and a highly elevated ESR. The clinical picture fits PMR perfectly. The functional limitations are due to pain and stiffness rather than true weakness.
(A) Bilateral adhesive capsulitis is unlikely to have a simultaneous onset and would not be associated with systemic symptoms like fever and malaise or a markedly elevated ESR. It presents with a capsular pattern of restriction, but lacks the systemic inflammatory component.
(C) Fibromyalgia involves widespread pain and tenderness, but it is a non-inflammatory condition. Therefore, inflammatory markers like ESR would be normal. It also does not typically present with such profound and localized morning stiffness in the shoulder girdles.
(D) Rheumatoid arthritis could present with bilateral shoulder involvement and elevated ESR. However, RA typically affects the small joints of the hands and feet symmetrically first, and lacks the specific predilection for the shoulder and pelvic girdles that is the hallmark of PMR.
- Based on this clinical presentation, what is the MOST likely diagnosis?
Answer: Deep gluteal syndrome
The correct answer is Deep gluteal syndrome. This is an umbrella term for sciatic nerve entrapment by a non-discogenic source in the subgluteal space, with piriformis syndrome being the most common cause. The classic features are present: buttock pain worsened by sitting, radicular-like pain not extending past the knee, absence of lumbar signs, and positive provocative tests like the FAIR test that tension the piriformis and other short external rotators over the sciatic nerve.
(A) L5-S1 lumbar radiculopathy would typically present with a positive straight leg raise or slump test and may be associated with dermatomal sensory loss, myotomal weakness, or reflex changes in the S1 distribution (e.g., diminished Achilles reflex). The absence of these findings and negative tension signs makes a lumbar origin less likely.
(B) Ischiofemoral impingement causes pain more medially and inferiorly in the buttock, closer to the ischial tuberosity. It is provoked by movements that narrow the space between the ischium and femur, such as combined hip extension, adduction, and external rotation.
(D) High hamstring tendinopathy presents with pain at the ischial tuberosity, which is inferior to the sciatic notch. The pain is typically aggravated by activities that involve forceful hamstring contraction, like running or sprinting, and by prolonged sitting that compresses the tendon.
- The positive result of the maneuver performed by the therapist increases the suspicion of which condition?
Answer: Retrocecal appendicitis
The correct answer is Retrocecal appendicitis. The maneuver described is the psoas sign. A positive psoas sign (pain with passive hip extension) suggests irritation of the iliopsoas muscle. In the context of migrating RLQ pain and tenderness at McBurney's point, this strongly suggests that a retrocecal appendix (an appendix located behind the cecum) is inflamed and irritating the overlying psoas muscle. This is a critical finding suggesting appendicitis.
(A) An inguinal hernia would present with a bulge in the groin and pain that might worsen with coughing or straining. It would not cause a positive psoas sign.
(B) An iliopsoas abscess would also cause a positive psoas sign and can present with abdominal or hip pain. However, it is less common and is usually associated with a high fever and a history of a recent infection (e.g., Crohn's disease, diverticulitis). The classic migration of pain from periumbilical to RLQ is the key feature pointing to appendicitis.
(C) A kidney stone passing through the ureter can cause severe flank pain that radiates to the groin. While it can cause abdominal pain, the classic migratory pattern and focal tenderness at McBurney's point are less common.
- This patient's constellation of symptoms is MOST suggestive of which of the following conditions?
Answer: Lyme disease
The correct answer is Lyme disease. The history is highly suggestive of early disseminated Lyme disease. Key features include the geographic location (Connecticut is an endemic area), recent history of a rash consistent with erythema migrans, and the subsequent development of migratory oligoarthritis, fatigue, and headaches. This clinical picture is classic for Lyme disease.
(A) Rheumatoid arthritis typically presents as a symmetric polyarthritis, primarily affecting the small joints of the hands and feet, and is associated with prolonged morning stiffness. The migratory, oligoarticular pattern in this patient is less typical for RA.
(B) Fibromyalgia is characterized by chronic widespread pain, fatigue, and tender points. However, it does not cause joint swelling (inflammation) or the characteristic preceding rash.
(C) Systemic lupus erythematosus is a multi-system autoimmune disease that can cause arthritis and fatigue. However, it is often associated with other features like a malar (butterfly) rash, photosensitivity, or renal involvement. The history of the specific circular rash after hiking strongly points towards Lyme disease.
- This specific combination of neurological signs is MOST consistent with an occlusion of which artery?
Answer: Posterior inferior cerebellar artery (PICA)
The correct answer is Posterior inferior cerebellar artery (PICA). This presentation is classic for Wallenberg syndrome, or lateral medullary syndrome, caused by an infarct in the territory of PICA. The key features are crossed sensory findings (ipsilateral face, contralateral body pain/temp loss), ipsilateral ataxia, vertigo, nystagmus, dysphagia, and hoarseness. This combination of brainstem and cerebellar signs points directly to the lateral medulla.
(A) An anterior cerebral artery occlusion would primarily cause contralateral leg weakness and sensory loss, along with possible frontal lobe signs like abulia or grasp reflexes.
(B) A middle cerebral artery occlusion, the most common type of stroke, would cause contralateral face and arm weakness and sensory loss greater than leg involvement, along with aphasia (if on the dominant side) or neglect (if on the non-dominant side).
(D) An anterior inferior cerebellar artery (AICA) occlusion can also cause vertigo, nystagmus, and ipsilateral ataxia. However, it is classically associated with ipsilateral hearing loss and facial paralysis, which are absent in this case. The crossed sensory findings are the hallmark of the PICA territory infarct.
- Given this clinical picture, which diagnosis requires the MOST immediate medical referral?
Answer: Deep Vein Thrombosis (DVT)
The correct answer is Deep Vein Thrombosis (DVT). The patient has multiple risk factors (recent major surgery, age) and classic signs/symptoms (unilateral calf swelling, pain, warmth, palpable cord). A Wells' score of 4 indicates a high probability of DVT, which is a medical emergency due to the risk of pulmonary embolism. Immediate referral for diagnostic ultrasound is critical.
(A) A ruptured popliteal cyst (pseudothrombophlebitis) can perfectly mimic the signs of a DVT. However, given the high-risk profile (post-operative) and the high Wells' score, DVT must be assumed and ruled out first. The palpable cord is also more suggestive of a thrombosed vein.
(B) Superficial thrombophlebitis involves a superficial vein and typically presents as a localized, linear, tender red cord. The diffuse, significant swelling and deep tenderness seen in this patient are more indicative of a deep system pathology.
(C) Cellulitis is a bacterial skin infection. While it presents with erythema, warmth, and swelling, it is often associated with a portal of entry (e.g., skin abrasion) and systemic signs like fever or malaise, which are absent here. The onset is also typically more gradual than what is described.
- Which of the following conditions BEST accounts for the patient's symptom pattern?
Answer: Lumbar spinal stenosis causing neurogenic claudication
The correct answer is Lumbar spinal stenosis causing neurogenic claudication. The key differentiating features are the positional relief of symptoms (sitting, leaning forward - the 'shopping cart sign') which mechanically opens the spinal canal, and the lack of symptoms with stationary cycling (where the spine is flexed). These strongly suggest a neurogenic origin. The pain distribution is also classic for stenosis.
(B) Peripheral arterial disease causing vascular claudication is a strong distractor due to the patient's risk factors and diminished pulses. However, vascular claudication is purely dependent on metabolic demand of the muscle. Symptoms would be reproduced by any leg exercise, including stationary cycling, and relief comes from simply stopping the activity, regardless of position. The positional relief is the key differentiator pointing away from vascular claudication.
(C) Bilateral piriformis syndrome is unlikely. It typically presents with buttock pain that may radiate down the leg but is not strongly related to walking distance and is usually aggravated by sitting, not relieved by it.
(D) Diabetic peripheral neuropathy typically presents with sensory disturbances like numbness, tingling, or burning in a 'stocking-glove' distribution, not activity-induced cramping pain that is relieved by rest and positional changes.
- Based on the patient's clinical presentation, which of the following conditions is the MOST likely diagnosis?
Answer: Cervical Spondylotic Myelopathy (CSM)
The correct answer is Cervical Spondylotic Myelopathy (CSM). The patient's age, insidious onset, neck stiffness, and combination of upper motor neuron (UMN) signs (hyperreflexia, Babinski, Hoffman's) and lower motor neuron (LMN) signs at the level of the lesion (hand weakness) are classic for CSM. The gait disturbance and hand clumsiness are hallmark features of spinal cord compression in the cervical region. The absence of significant pain and the presence of only vague sensory changes are also characteristic.
(A) Amyotrophic Lateral Sclerosis (ALS) is a strong distractor due to the presence of UMN signs. However, ALS is a progressive disease of both UMN and LMNs, and one would expect to see more widespread LMN signs like fasciculations and significant muscle atrophy, which are not reported. Also, neck stiffness is a primary complaint pointing towards a cervical spine origin.
(C) Multiple Sclerosis (MS) can present with UMN signs, but the age of onset is typically younger (20-40 years). MS often presents with other symptoms not seen here, such as optic neuritis, significant fatigue, or a relapsing-remitting course. The presentation is more consistent with a focal compressive lesion than demyelinating plaques.
(D) Syringomyelia would present with UMN signs below the level of the syrinx. However, its classic presentation includes a 'cape-like' distribution of dissociated sensory loss (loss of pain and temperature with preserved light touch) across the upper back and arms, which is absent in this patient.
- Which of the following conditions is the MOST likely cause of the patient's symptoms?
Answer: Neurogenic thoracic outlet syndrome (TOS)
The correct answer is Neurogenic thoracic outlet syndrome (TOS). The symptom cluster involving pain and paresthesias in a C8-T1 distribution, reproduction of symptoms with provocative maneuvers that compress the thoracic outlet (Adson's, EAST), and postural contributing factors (drooping shoulder) strongly points to neurogenic TOS. The weakness in ulnar-innervated intrinsic hand muscles is also consistent with lower trunk brachial plexus compression.
(A) C8-T1 radiculopathy is a primary differential. However, symptoms are typically exacerbated by cervical movements (e.g., Spurling's test) and relieved by shoulder abduction (Bakody's sign), which is the opposite of what is often seen in TOS. The provocative tests for TOS being positive makes it the more likely diagnosis.
(C) A Pancoast tumor can cause C8-T1 symptoms (pain, paresthesias, intrinsic weakness) due to invasion of the brachial plexus. However, the patient's unremarkable chest radiograph makes this diagnosis highly unlikely. Furthermore, Horner's syndrome (ptosis, miosis, anhidrosis) is often present with Pancoast tumors and is not mentioned here.
(D) Suprascapular nerve entrapment would cause deep, dull pain in the posterior shoulder and weakness in the supraspinatus and infraspinatus (abduction and external rotation), not sensory changes or weakness in the hand.
- Which of the following conditions is the MOST likely cause of her current symptoms?
Answer: Guillain-Barré syndrome (GBS)
The correct answer is Guillain-Barré syndrome (GBS). The classic presentation of GBS is a rapidly ascending, symmetrical weakness, often following a recent infection (respiratory or GI). Areflexia or hyporeflexia is a hallmark sign. The distal sensory changes are also characteristic. The progression of symptoms over days is typical for the acute phase of GBS.
(A) Transverse myelitis is an inflammatory condition of the spinal cord. It typically presents with a distinct sensory level, more prominent upper motor neuron signs (hyperreflexia, spasticity) below the level of the lesion, and often includes bowel/bladder dysfunction, which are not the primary features here.
(C) Acute inflammatory myopathies (like polymyositis or dermatomyositis) primarily cause proximal muscle weakness, and reflexes are usually preserved until late in the disease. They do not typically present with the ascending pattern or areflexia seen in GBS.
(D) Tick paralysis also causes an ascending paralysis. However, it resolves rapidly after removal of the embedded tick. A thorough skin check for a tick would be part of the workup, but GBS is more likely given the classic post-infectious trigger and clinical pattern.
- Which of the following conditions is the MOST critical diagnosis to identify?
Answer: Cauda equina syndrome
The correct answer is Cauda equina syndrome (CES). This is a surgical emergency. The classic triad of symptoms is saddle anesthesia, bowel/bladder dysfunction (in this case, urinary retention), and bilateral lower extremity weakness. This patient presents with all three. CES is caused by compression of the nerve roots of the cauda equina, and delayed treatment can lead to permanent paralysis and incontinence. The LMN signs (areflexia, weakness) are characteristic of nerve root compression.
(A) Conus medullaris syndrome involves injury to the sacral spinal cord itself. It can also present with saddle anesthesia and bladder dysfunction, but it characteristically presents with a combination of UMN and LMN signs, and the onset of symptoms is often sudden and bilateral. While there is overlap, the pure LMN signs (absent reflexes) and severe radicular pain make CES more likely.
(C) A large central disc herniation is the likely cause, but the diagnosis is not complete without acknowledging the resulting neurological compromise. The presence of saddle anesthesia and urinary retention signifies that this is not a simple disc herniation and must be treated as an emergency.
(D) Bilateral S1 radiculopathy would explain the Achilles areflexia and plantarflexion weakness. However, it would not explain the saddle anesthesia or the urinary retention, which are the most alarming red flag signs in this presentation.
- This patient's clinical presentation is MOST characteristic of which condition?
Answer: Ankylosing spondylitis (AS)
The correct answer is Ankylosing spondylitis (AS). This is a classic presentation for AS, an inflammatory arthritis affecting the axial skeleton. Key features include male predominance, age of onset <40 years, insidious onset of inflammatory back pain (worse with rest, better with activity), significant morning stiffness, SI joint involvement, and extra-articular manifestations like uveitis. The positive Schober's test indicates restricted lumbar flexion, a common finding.
(A) Diffuse idiopathic skeletal hyperostosis (DISH) causes spinal stiffness but typically affects an older population (>50 years old), does not primarily involve the SI joints, and is not associated with the inflammatory markers or extra-articular features like uveitis seen in AS.
(B) Lumbar degenerative disc disease causes mechanical back pain, which typically worsens with activity and improves with rest, the opposite pattern of inflammatory back pain. Morning stiffness is usually brief (<30 minutes).
(C) Mechanical sacroiliac joint dysfunction can cause pain over the SI joints but it is typically unilateral and does not cause the profound morning stiffness, progressive loss of spinal mobility, or systemic inflammatory features (uveitis) seen in this case.
