Tumoral calcinosis of the popliteal space.

Tumoral calcinosis is a rare clinical and histopathologic syndrome characterized by calcium salt deposits in periarticular soft tissue.1,2 Softtissue of juxta-articular upper limb (shoulder and elbow) and hip regions are the most commonly involved; however, spinal3-5 and temporomandibular joint6,7 involvement has also been reported. The extensor aspect of the joint is the usual site of the lesions, often connected with a synovial bursa.8,9 The rarest localization is in the popliteal space, with only one monolateral case reported in the literature.10 This article describes a rare localization of tumoral calcinosis in a patient with chronic renal failure on long-term hemodialysis therapy without metabolic phosphorus and calcium disorders. The lesions were bilateral and symmetrical in the popliteal space with neurovascular involvement and functional limitation.