Upper/Lower Limb US Medical PG Practice Questions and MCQs
Practice US Medical PG questions for Upper/Lower Limb. These multiple choice questions (MCQs) cover important concepts and help you prepare for your exams.
Upper/Lower Limb US Medical PG Question 1: A 52-year-old man with stage IV melanoma comes to the physician with his wife for a routine follow-up examination. He was recently diagnosed with new bone and brain metastases despite receiving aggressive chemotherapy but has not disclosed this to his wife. He has given verbal consent to discuss his prognosis with his wife and asks the doctor to inform her of his condition because he does not wish to do so himself. She is tearful and has many questions about his condition. Which of the following would be the most appropriate statement by the physician to begin the interview with the patient's wife?
- A. Have you discussed a living will or goals of care together?
- B. We should talk about how we can manage his symptoms with additional chemotherapy.
- C. Why do you think your husband has not discussed his medical condition with you?
- D. What is your understanding of your husband's current condition? (Correct Answer)
- E. Your husband has end-stage cancer, and his prognosis is poor.
Upper/Lower Limb Explanation: ***What is your understanding of your husband's current condition?***
- This statement initiates the conversation by **assessing the wife's current knowledge** and emotional state, which is crucial for delivering sensitive and appropriate information.
- It allows the physician to tailor the discussion to her specific understanding and concerns, ensuring that information is delivered compassionately and effectively.
*Have you discussed a living will or goals of care together?*
- This question is too abrupt and **premature** as an opening, as the wife is clearly distressed and unaware of the full severity of her husband's condition.
- Discussions about end-of-life planning should only occur after the patient's wife has a clear understanding of the diagnosis and prognosis, and has processed this information.
*Your husband has end-stage cancer, and his prognosis is poor.*
- While factual, this statement is **too blunt and lacks empathy** for an opening, especially given the wife's emotional state and lack of prior knowledge.
- Delivering such devastating news directly without first assessing her understanding or providing context can be traumatic and impede effective communication.
*We should talk about how we can manage his symptoms with additional chemotherapy.*
- This statement implies a focus on further aggressive treatment which may not be appropriate given the **new bone and brain metastases** and aggressive prior chemotherapy, suggesting a limited benefit of more chemotherapy.
- It also **diverts from the primary need to discuss the overall prognosis** and the patient's rapidly declining condition, which the doctor has been asked to convey.
*Why do you think your husband has not discussed his medical condition with you?*
- This question is **accusatory** and places blame on either the patient or the wife, which is inappropriate and unhelpful in a sensitive medical discussion.
- It shifts the focus away from providing medical information and empathy towards a speculative and potentially confrontational topic.
Upper/Lower Limb US Medical PG Question 2: A 6-month-old male presents to the emergency department with his parents after his three-year-old brother hit him on the arm with a toy truck. His parents are concerned that the minor trauma caused an unusual amount of bruising. The patient has otherwise been developing well and meeting all his milestones. His parents report that he sleeps throughout the night and has just started to experiment with solid food. The patient’s older brother is in good health, but the patient’s mother reports that some members of her family have an unknown blood disorder. On physical exam, the patient is agitated and difficult to soothe. He has 2-3 inches of ecchymoses and swelling on the lateral aspect of the left forearm. The patient has a neurological exam within normal limits and pale skin with blue irises. An ophthalmologic evaluation is deferred.
Which of the following is the best initial step?
- A. Genetic testing
- B. Complete blood count and coagulation panel (Correct Answer)
- C. Ensure the child's safety and alert the police
- D. Peripheral blood smear
- E. Hemoglobin electrophoresis
Upper/Lower Limb Explanation: ***Complete blood count and coagulation panel***
- The unusual amount of **bruising** after minor trauma, along with a family history of an unknown blood disorder, strongly suggests a potential **bleeding disorder**. A **CBC** and a **coagulation panel** (PT, aPTT, fibrinogen) are essential initial steps to evaluate for abnormalities in platelets, clotting factors, or other hematologic conditions.
- These tests can help narrow down the differential diagnosis between **platelet dysfunction**, **coagulopathies** (like hemophilia or von Willebrand disease), or other less common bleeding disorders, guiding further specific investigations.
- **Important consideration:** The presence of **blue sclera** (described as "blue irises") raises concern for **osteogenesis imperfecta (OI)**, a connective tissue disorder causing bone fragility. However, initial hematologic screening is still appropriate given the family history of blood disorder and presentation of excessive bruising. If coagulation studies are normal, imaging and further workup for OI would be indicated.
*Genetic testing*
- While a genetic component is plausible given the patient's family history and clinical presentation (blue sclera may suggest osteogenesis imperfecta), **genetic testing** is typically performed *after* initial laboratory workup has identified a specific type of bleeding or inherited disorder.
- Starting with genetic testing without basic hematologic parameters is not the most efficient or cost-effective initial diagnostic approach.
*Ensure the child's safety and alert the police*
- While child abuse should always be considered in cases of unexplained or excessive bruising, the presence of a **family history of a blood disorder** and the **blue sclera** (suggesting possible osteogenesis imperfecta) make **medical causes** more immediate concerns for initial investigation.
- Pursuing a medical workup first often clarifies whether abuse is the primary explanation, although child protective services should be notified if suspicion remains high after medical evaluation.
*Peripheral blood smear*
- A **peripheral blood smear** provides information on red blood cell morphology, platelet size and number, and white blood cell differential. While useful in assessing for some hematologic conditions, it is often performed *after* a CBC has indicated abnormalities or in conjunction with specialized testing.
- It would not be the *best initial step* as it doesn't directly assess clotting factor function, which is critical in evaluating significant bruising severity.
*Hemoglobin electrophoresis*
- **Hemoglobin electrophoresis** is used to diagnose **hemoglobinopathies** like sickle cell anemia or thalassemia.
- The patient's symptoms (easy bruising) are not characteristic of hemoglobinopathies, and while he has pale skin, this test would not be the initial step to investigate a bleeding disorder.
Upper/Lower Limb US Medical PG Question 3: A 31-year-old woman presents with difficulty walking and climbing stairs for the last 3 weeks. She has no history of trauma. The physical examination reveals a waddling gait with the trunk swaying from side-to-side towards the weight-bearing limb. When she stands on her right leg, the pelvis on the left side falls. When she stands on her left leg, the pelvis remains level. Which of the following nerves is most likely injured in this patient?
- A. Right inferior gluteal nerve
- B. Right obturator nerve
- C. Right superior gluteal nerve (Correct Answer)
- D. Right femoral nerve
- E. Left femoral nerve
Upper/Lower Limb Explanation: ***Right superior gluteal nerve***
- The presentation of a **waddling gait** and the **Trendelenburg sign** (pelvis dropping on the unsupported side) is characteristic of **gluteus medius** and **minimus** weakness.
- These muscles are innervated by the **superior gluteal nerve**. In this case, when the patient stands on her right leg, the left pelvis falls, indicating weakness of the right gluteus medius/minimus.
*Right inferior gluteal nerve*
- The **inferior gluteal nerve** innervates the **gluteus maximus**, which is primarily responsible for hip extension.
- Damage to this nerve would primarily lead to difficulty with **climbing stairs** and rising from a seated position, but not typically the specific pelvic drop described.
*Right obturator nerve*
- The **obturator nerve** innervates the **adductor muscles** of the thigh.
- Damage would result in weakness of hip adduction and **medial thigh sensory deficits**, which are not the primary symptoms here.
*Right femoral nerve*
- The **femoral nerve** innervates the **quadriceps femoris** and the **sartorius**, responsible for knee extension and hip flexion.
- Injury would cause difficulty with **knee extension** and **hip flexion**, potentially leading to knee buckling or instability, which is not consistent with the Trendelenburg sign observed.
*Left femoral nerve*
- Injury to the left femoral nerve would affect the **left quadriceps** and **sartorius** muscles.
- This would cause weakness in extending the left knee and flexing the left hip, which is not consistent with the observed **right-sided gluteal weakness** indicated by the Trendelenburg sign on the right.
Upper/Lower Limb US Medical PG Question 4: A 51-year-old woman comes to the physician because of progressively worsening lower back pain. The pain radiates down the right leg to the lateral side of the foot. She has had no trauma, urinary incontinence, or fever. An MRI of the lumbar spine shows disc degeneration and herniation at the level of L5–S1. Which of the following is the most likely finding on physical examination?
- A. Difficulty walking on heels
- B. Exaggerated patellar tendon reflex
- C. Diminished sensation of the anus and genitalia
- D. Diminished sensation of the anterior lateral thigh
- E. Weak Achilles tendon reflex (Correct Answer)
Upper/Lower Limb Explanation: ***Weak Achilles tendon reflex***
- A herniated disc at **L5-S1** typically compresses the **S1 nerve root**, which is responsible for the **Achilles tendon reflex**.
- **S1 radiculopathy** presents with weakness in plantarflexion, diminished or absent Achilles reflex, and sensory loss in the **lateral foot** (matching the patient's symptoms).
*Difficulty walking on heels*
- Difficulty walking on heels (**dorsiflexion weakness**) is primarily associated with **L4-L5 disc herniation** compressing the **L5 nerve root**.
- This symptom indicates **L5 radiculopathy**, which affects the tibialis anterior muscle, not S1.
*Exaggerated patellar tendon reflex*
- An exaggerated patellar tendon reflex (**hyperreflexia**) indicates an **upper motor neuron lesion** or spinal cord compression above the lumbar region.
- A disc herniation at **L5-S1** causes a **lower motor neuron lesion** with diminished reflexes, not hyperreflexia.
*Diminished sensation of the anus and genitalia*
- This symptom, along with urinary incontinence and saddle anesthesia, is characteristic of **cauda equina syndrome**, a surgical emergency.
- The patient lacks urinary incontinence and the specific unilateral pain pattern points to isolated **S1 radiculopathy**, not cauda equina syndrome.
*Diminished sensation of the anterior lateral thigh*
- Sensory loss in the **anterior lateral thigh** is associated with compression of the **lateral femoral cutaneous nerve** or **L2-L4 nerve roots**.
- This pattern is not consistent with **L5-S1 disc herniation**, which causes sensory changes in the lateral foot and posterior leg.
Upper/Lower Limb US Medical PG Question 5: A 41-year-old woman presents with back pain for the past 2 days. She says that the pain radiates down along the posterior right thigh and leg. She says the pain started suddenly after lifting a heavy box 2 days ago. Past medical history is irrelevant. Physical examination reveals a straight leg raise (SLR) test restricted to 30°, inability to walk on her toes, decreased sensation along the lateral border of her right foot, and diminished ankle jerk on the same side. Which of the following nerve roots is most likely compressed?
- A. Fourth lumbar nerve root (L4)
- B. Second sacral nerve root (S2)
- C. Third sacral nerve root (S3)
- D. Fifth lumbar nerve root (L5)
- E. First sacral nerve root (S1) (Correct Answer)
Upper/Lower Limb Explanation: ***First sacral nerve root (S1)***
- **Inability to walk on toes** (weakness of gastrocnemius and soleus), **decreased sensation along the lateral border of the foot**, and a **diminished ankle jerk** are classic signs of S1 radiculopathy.
- The radiating pain down the posterior leg, restricted straight leg raise due to a sudden onset after lifting, points towards a **disc herniation** compressing the S1 nerve root.
*Fourth lumbar nerve root (L4)*
- Compression of L4 typically causes **weakness in knee extension** (quadriceps), diminished patellar reflex, and sensory loss over the medial aspect of the shin.
- The patient's symptoms (inability to walk on toes, diminished ankle jerk) are not consistent with L4 nerve root involvement.
*Second sacral nerve root (S2)*
- S2 radiculopathy primarily affects sensation in the posterior thigh and calf and can cause **weakness in knee flexion** and **plantarflexion**, but the complete constellation of symptoms (especially ankle jerk reflex) is more indicative of S1.
- Isolated S2 compression without S1 involvement is less common with these specific signs.
*Third sacral nerve root (S3)*
- S3 nerve root compression typically presents with **perineal numbness** and issues with bowel or bladder function due to its involvement in these functions.
- The described motor and sensory deficits are not characteristic of S3 radiculopathy.
*Fifth lumbar nerve root (L5)*
- L5 radiculopathy is characterized by **weakness in foot dorsiflexion** (foot drop) and toe extension, leading to inability to walk on heels, and sensory loss on the dorsum of the foot.
- While L5 compression can cause radiating pain and a restricted straight leg raise, the specific deficit of **inability to walk on toes** and a **diminished ankle jerk** are not typical of L5 involvement.
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