Atypical columnar cell hyperplasia of the breast, case report
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Columnar cell lesions of the breast are lesions that have slightly or pronounced cytological and structurally atypia that originating from the dilated terminal ductal lobular unity. In this case report we have presented a case who is a 48 years old woman with a 2 cm tumor on her left breast. The diagnosis of the fine needle aspiration biopsy of the tumor was “malignant epithelial cells”. Then it is followed by a tru-cut biopsy which has been reported as a fibroadenoma. Five days later of the tru-cut biopsy she has undergone a lumpectomy and sentinel lymph node biopsy operation with the frozen section procedure and reported as cellular fibroadenoma versus benign philloides tumors with tumor negative sentinel lymph node. On microscopic examination of the lesion has demonstrated a well delineated lesion with the ducts dilated where the lumens were commonly open and surrounded with a pseudostratified low columnar epithelium. The case has been diagnosed as an atypical columnar cell hyperplasia with these findings. This case has been presented as its is not only a rarely appearing lesion of the breast it has diagnostic difficulties both in the fine needle aspiration biopsy, tru-cut biopsy and frozen sections.