Cholinergic synovitis: Description of four cases.

Abstract

We present the clinical and ultrasound findings of four patients with moderate synovitis and urticarial skin lesions associated with sports activity in warm environments. We include progress after treatment with hydroxycin. We suggest a causal relationship similar to cholinergic urticaria where the neighbouring synovium responds with effusion that self-limits once the triggering process has been halted.