Abstract: Objective: To investigate the clinical manifestations and histopathologic features of the tumoral calcinosis at active stage.Methods: The clinicopathologic features of 13 cases of tumoral calcinosis at active stage were retrospectively analysed.Results: Of the 13 cases diagnosed as tumoral calcinosis at active stage,7 were men and 6 were women.The age ranged from 16 to 65 years and the course of disease was 1 to 11 years.Multiple masses were found in 3 cases and solitary nodule in 10 cases.Conclusions: The clinical symptom of the tumoral calcinosis at active stage is painless masses.The masses develope in the parosteal or juxta-articular part,not invading the bone or the articulation.X-ray shows characteristic calcific shadow.The pathologic manifestations are multi cystic or solid nodules.The cyst wall is lined by the granulation tissues and the internal capsular contains the amorphous calcium salt granule.