Cylindroma of the breast: a rare case report.

Cylindroma is a benign adnexal tumor, which occurs as solitary dermal nodules on the scalp and forehead. Cylindroma of the breast is a rare lesion. Fine-needle aspiration is often the first line of investigation. In this communication, we illustrate the cytomorphological feature of cylindroma in a 61-year-old female patient who presented with a breast lump. Fine-needle aspiration cytology in this case reveals the islands of tumor cells formed a "jig-saw" pattern, along with the bland, basaloid cells associated with globular, extracellular material. These features are typical of cylindroma, but differential diagnosis of adenoidcystic carcinoma should always be kept in mind as the management of both tumors are different.