Pseudoangiomatous stromal hyperplasia causing severe breast enlargement in a 15-year-old girl: A case report.

Pseudoangiomatous stromal hyperplasia (PASH), composed of proliferated stromal mesenchymal cells of myofibroblastic origin, is a benign lesion of the breast. A few cases associated with pseudoangiomatous stromal hyperplasia of the breast have been reported. We report this case of a 15-year-old girl with PASH accompanied by severe enlargement and painful mass in the right breast. There were no other palpable masses or lymph nodes. Biopsy of the mass showed histopathologic features characteristic of fibroadenoma. The palpable mass was around 6x5cm in diameter, while clinical manifestations aroused suspicion of malignancy mimicking sarcoma of the breast. Although, biopsy of the mass showed benign histopathologic features; surgical excision was performed because of the damage caused by enlarging breast tissue and clinical suspicion of malignancy.