Immunopathology of Polymyalgia Rheumatica on Shoulder Bursae's Biopsies

The biopsy of the shoulder bursae will be carried out thanks to a device Tru-cut (Tru-Cut Biopsy Needle), minimally invasive, introduced, as during an infiltration, within the bursa serosa.

In case of associated peripheric arthritis, the patient will also be offered a sample of joint fluid during a cortisonic infiltration for analgesic purposes, performed as part of routine care.

A blood sample taken during routine care and unused will also be collected from patients and controls for immunoassays.