Which condition is commonly suggested by bilateral distal weakness with preserved sensation?

Which condition is commonly suggested by bilateral distal weakness with preserved sensation?

• A. Alcohol myopathy
• B. Polyneuropathy
• C. Myositis
• D. Neuromuscular junction disorders

Answer: (B)

A pattern of bilateral distal weakness with preserved sensation points to a neuropathic process affecting motor nerves rather than muscle fibers or sensory pathways. When multiple peripheral nerves are involved—often starting distally—the result is symmetric distal weakness that can occur with little or no sensory loss early on. This matches a motor-dominant polyneuropathy, where motor fibers are affected more prominently than sensory fibers in some cases, explaining the weakness while sensation remains intact. Alcohol myopathy and myositis are muscle diseases that produce weakness with proximal predominance, not distal. Neuromuscular junction disorders typically cause fatigable weakness with a tendency toward proximal weakness and fluctuating strength, rather than a symmetric distal pattern with preserved sensation.

A pattern of bilateral distal weakness with preserved sensation points to a neuropathic process affecting motor nerves rather than muscle fibers or sensory pathways. When multiple peripheral nerves are involved—often starting distally—the result is symmetric distal weakness that can occur with little or no sensory loss early on. This matches a motor-dominant polyneuropathy, where motor fibers are affected more prominently than sensory fibers in some cases, explaining the weakness while sensation remains intact.

Alcohol myopathy and myositis are muscle diseases that produce weakness with proximal predominance, not distal. Neuromuscular junction disorders typically cause fatigable weakness with a tendency toward proximal weakness and fluctuating strength, rather than a symmetric distal pattern with preserved sensation.