Pseudoangiomatous stromal hyperplasia
 Discussion of Pseudoangiomatous stromal hyperplasia
- Pseudoangiomatous stromal hyperplasia (PASH) is a benign proliferative lesion of mammary stroma
- Contains complex anastomosing spaces that may be confused with angiosarcoma at histologic analysis.
- It represents a clinicopathologic spectrum ranging from focal, incidental microscopic findings to clinically and mammographically evident breast masses.
- PASH is a relatively common incidental finding at breast biopsy (Ibrahim et al reported 23%).
- The tumoral form of PASH (clinically and mammographically evident breast masses) is rare.
- Tumoral PASH has frequently been misdiagnosed at clinical examination as a fibroadenoma.
- The tumoral form of PASH most commonly manifests as a single, circumscribed, palpable mass in a premenopausal female. The mass is usually large (5–6 cm in diameter), with reported diameters ranging from 1 to 12 cm.
- Although mass lesions in PASH often grow over time and may recur after excisional biopsy, they are neither associated with malignancy nor considered to be premalignant lesions.
 Imaging Findings for Pseudoangiomatous stromal hyperplasia
- At mammography, masses due to PASH are usually non-calcified and appear well circumscribed or partially circumscribed.
- The masses are seen at US as hypoechoic solid masses and echotexture may be slightly heterogeneous.
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 References for Pseudoangiomatous stromal hyperplasia
- Dvora Cyrlak, and Philip M. Carpenter. Breast Imaging Case of the Day. RadioGraphics 1999 19: 1086-1088.