Silent radiolucent lesion with thin sclerotic border discovered incidentally on x-ray is a/an

Correct Answer: A

Rationale: Nonossifying fibroma is a common benign lesion with a radiolucent center and sclerotic border, often found incidentally.

Correct Answer: D

Rationale: In Guillain-Barré syndrome, progressive weakness can lead to respiratory muscle involvement, making pulmonary function tests critical to monitor breathing capacity and prevent respiratory failure. ECG is useful for autonomic dysfunction but less urgent; CPK is normal in GBS as it's a neuropathy, not myopathy; urine specific gravity is unrelated.

Correct Answer: B

Rationale: Myopathies (e.g., muscular dystrophy) typically present with proximal weakness. Polyneuropathy causes distal weakness; neuromuscular junction defects and upper motor neuron defects don't specifically target proximal muscles.

Correct Answer: C

Rationale: McArdle syndrome (glycogen storage disease V) leads to exercise-induced rhabdomyolysis due to impaired glycogen breakdown. Others don't typically cause this.

Correct Answer: C

Rationale: Duchenne muscular dystrophy presents with proximal weakness (difficulty climbing stairs), delayed motor milestones, and pseudohypertrophy of calves. Other conditions don't match this pattern.