Abstract
Case 1 : A 60-year-old woman was found to have a left breast mass, 5.5 cm in diameter. Ultrasonography showed a well defined circumscribed low echoic mass. Fine needle aspiration biopsy showed no malignant cells. We excised the mass and the histopathological diagnosis was pseudoangiomatous stromal hyperplasia (PASH).
Case 2 : A 50-year-old woman was suffering from a left breast mass. We excised the mass, and the pathological diagnosis was fibroadenoma. Two years later, a recurrent tumor was resected at the same site. The pathological diagnosis was PASH, which we rediagnosed in the first operative specimen after the second operation. Alpha-smooth muscle antigen, desmin, and part of CD34 were positive in the stromal cells on immunohistochemical studies of both cases.
Case 2 was a recurrent case, and case 1 was a passively recurrent case, so careful observation is needed.
