Accessory abductor digiti minimi

Discussion:

The patient's wrist swelling was accounted for by dorsal wrist ganglia.

An accessory abductor digiti minimi muscle was demonstrated in Guyon's canal. There is no symptom of ulnar neuropathy in Guyon's canal due to the presence of an accessory muscle.

The accessory abductor digiti minimi is the most common accessory muscle of the hand, occurring in up to 25% of the population.

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