A giant calcifying pseudocyst seen in a patient with overlap syndrome

A case of female with a large cystic tumor in her infrascapular region is reported. The tumor was 8 cm x 7 cm in size. Histologically, it was a pseudocyst with calcification. The patient showed no abnormal renal functions other than proteinuria. Because she had suffered from overlap syndromes of systemic lupus erythematosus, progressive systemic sclerosis, and suspected dermatomyositis, we diagnosed this a unique case of dystrophic calcinosis. There have been several reports of cases with connective tissue diseases showing subcutaneous calcification, but to our knowledge no such giant calcifying pseudocyst has ever been reported.