Calcinosis cutis is the term used for the deposition of calcium salts in the skin and subcutaneous tissues.
Pathology
It is classified according to etiology as 1:
dystrophic (most common): characterized by normal serum calcium and phosphorus, an underlying disease process induces tissue damage
metastatic: abnormal serum calcium and phosphorus
It can be classified according to the pattern of distribution as 1-3:
calcinosis cutis circumscripta: localized skin and subcutaneous calcifications predominantly around joints and extremity
calcinosis cutis universalis: diffuse involvement of skin, subcutaneous tissues, muscles and tendons
Differential diagnosis
Consider all causes of soft tissue calcification including osteoma cutis.
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