Tumoral calcinosis is a well established but rare clinical entity. It was first described in 1889, and since then, scattered reports have been present in the literatures from many parts of the world.
The patient reported here is a 55-year-old male who has developed a solitary tumor with local pain on the ischial tuberosity. There had been no preceding trauma and no significant illness of note. Physical examination revealed a firm, hard mass on the ischial tuberosity. There was no limitation of motion. Laboratory studies revealed that the serum phosphate level remained in the normal range but the serum calcium level remained slightly elevated. The serum parathyroid hormone level and renal function studies were within normal limits.
Radiographs showed multinodular, calcified soft tissue masses on the left ischial tuberosity. Pathological findings are also characteristic.
We resected the tumor and then found that its main composition was hydroxyapatite by X-ray diffraction study.
