Pronator teres syndrome is characterized by compression of the median nerve, leading to dysfunction of the affected limb. Median nerve entrapment causes paresthesia, changes in sensitivity, and loss of strength in the fingers, in addition to causing loss of hand dexterity. The diagnosis of pronator teres syndrome is complicated, due to its similarity with other neuropathies of the median nerve. So, it is important to emphasize the need for a physical examination together with imaging tests, especially ultrasound, for its correct diagnosis. We report the case of a 28-year-old woman who complained of tingling for ten years in the proximal third of the left forearm at rest that worsens on exertion and weakness if not moving. On physical examination, she has no limitation of movement but refers to a feeling of weakness and numbness in his forearm. Ultrasonography demonstrates compression of the median nerve between the ulnar and humeral heads of the pronator teres muscle, a finding confirmed by magnetic resonance imaging and electroneuromyography. The patient was treated with physiotherapy presenting improvement of symptoms after 45 days.

Department of Orthopedics Irmandade da Santa Casa de Misericórdia de Santos Santos Brazil

Department of Radiology Diagnósticos da América S A São Paulo Brazil

Universidade de Ribeirão Preto Campus Guarujá Guarujá Brazil

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