An inconstant bursa between the two heads of pronator teres where the median nerve passes, or between pronator teres and the radius at its insertion. It reduces friction at the pronator teres insertion on the lateral radial shaft.
Pronator teres bursitis can contribute to median nerve compression in pronator syndrome, presenting as forearm pain and median distribution dysaesthesiae worse with resisted pronation. It is distinguished from carpal tunnel syndrome by the absence of nocturnal symptoms and positive pronation provocation test. Ultrasound may identify bursal thickening adjacent to the median nerve.
Bursal inflammation between the pronator teres heads contributing to median nerve compression, producing forearm pain and dysaesthesiae in a median distribution provoked by resisted forearm pronation.
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