Echinococcal involvement of the breast is extremely rare and usually not included in the differential diagnosis of breast lumps.
This is an unreported case of a 56-year-old woman who came with a 3 cm mammary mass. Mammography showed a dense well-circumscribed lesion with calcifications. The diagnosis was established by fine needle aspiration and confirmed by pathological study.
Hydatid cyst of the breast is rare. The diagnosis by fine needle aspiration is controversial. The treatment is based on complete excision of the cyst.
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