Ductal Carcinoma in Situ within a Benign Phyllodes Tumor of Breast: Report of a Case

Phyllodes tumor (PT) is not a common phenomenon and its coexistence with ductal carcinoma in situ (DCIS) is extremely rare. A few of these cases have been reported in the literatures.
We report a case of PT that a DCIS tumor has arisen from its epithelial component in a 26 year-old woman. The patient was referred to a surgeon with a palpable mass in her left breast. Ultrasonography failed to distinguish between fibroadenoma and PT. Excisional biopsy was performed for her and after pathologic study, the above - mentioned diagnosis was reported. Histologically stroma showed moderate cellularity with few mitoses. The epithelial component consisted of foci of ductal hyperplasia with comedo necrosis. After consultation with oncologists, simple mastectomy and reconstruction was performed for her. The patient was satisfied with the results.
Diagnosis of DCIS within a PT before surgery is impossible and pathologist should confirm it. Different plans for their treatment have had good short term results.