A 4-year-old boy has difficulty climbing stairs, calf pseudohypertrophy and a positive Gowers sign. What is the most likely diagnosis?
Answer and explanation
Correct answer: C. Duchenne muscular dystrophy
- Step 1: The picture of a positive Gowers sign with calf pseudohypertrophy fits Duchenne muscular dystrophy.
Answer
Duchenne muscular dystrophy.
Why not the others: 'Spinal muscular atrophy': it gives weakness with fasciculations and absent reflexes. 'Becker muscular dystrophy': it follows a milder, later course. 'Juvenile dermatomyositis': it gives a rash with proximal weakness and raised inflammatory signs.
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