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Median nerve entrapment due to accessory palmaris longus muscle: MRI and sonography findings

Peripheral neuropathies of the median nerve at various locations in the upper extremity are common, but compression of the median nerve at the level of the wrist due to an anomalous muscle is rare though presented in the English database.1 2

Here, we present a 35-years-old left-handed woman who had a swelling in the distal third of her left forearm, present since childhood, fluctuating in size and causing paresthesias on the palm.

On physical examination, a swelling on the volar aspect was detected. Electromyography was consistent with carpal tunnel syndrome of moderate severity. MRI revealed a subcutaneous soft tissue of muscle intensity …