右腰部に生じたtumoral calcinosis

・皮膚沈着症（calcinosis cutis）は，基礎疾患により3つに分類されている．

・その中でも，カルシウム，リン代謝異常，膠原病などの基礎疾患や腫瘍，外傷などの誘因がないものをidiopathic typeといい，自験例のtumoral calcinosisはこの中に属する．

・tumoral calcinosisは本邦において20例しか過去に報告がなく，比較的まれな疾患といえる．

（「症例のポイント」より）

　

A case of tumoral calcinosis

　

Hoshiyama, Yasuko1）Yanagihara, Shigeto2）Oiso, Naoki2）Kawada, Akira2） 1）Department of Dermatology, JCHO Osaka Hospital 2）Department of Dermatology, Kindai University Faculty of Medicine

　

We report a 78-year-old Japanese female patient with 3 years history of a subepidermal nodule on the right lumbar. Physical examination revealed a slightly raised, firm and painful nodule of 25*30 mm in size. Blood tests were not unusual. This nodular skin lesion was evaluated with computed tomography, indicating a high concentration region in the subcutaneous fat. Histopathological findings showed in the subcutaneous tissue masses of calcium deposition surrounded by fibrous tissue. This patient had neither hypercalcemia nor hyperphosphatemia and showed no underlying diseases. So, we diagnosed as tumoral calcinosis. Tumoral calcinosis is classified into the idiopathic calcinosis cutis. The mechanism of the calcification is still unclear. 6 months have passed after excision, but it does not recur. Because tumoral calcinosis is known to be prone to recurrence, we should continue with the follow-up observations have to a regular observation.