Pisiform bursitis: a forgotten pathology.

Pisiform bursitis is a disease often forgotten in both everyday practice and medical literature. The pisiform bursa is not constant; when present, it is located between the tendon of the flexor carpi ulnaris and pisiform bone. Bursitis causes pain in the medial side of the wrist and enters into the differential diagnosis of various diseases of this anatomic region, in particular, with enthesitis of the flexor carpi ulnaris and the ganglion of piso-pyramidal compartment. We present the sonographic appearance of pisiform bursitis in a symptomatic patient.