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J Clin Ultrasound. 2005 Dec;33(9):468-70.

Sonographic appearance of a carcinoma developed in ectopic axillary breast tissue.


Primary breast cancer of ectopic axillary breast tissue is almost never diagnosed preoperatively. When not accompanied by nipple-areolar complex, the mass is often believed to be a lipoma, an enlarged lymph node, or a skin lesion such as a sebaceous cyst or hydradenitis suppurativa. When an axillary mass is found, a percutaneous needle biopsy is mandatory to rule out the diagnosis of cancer in ectopic breast tissue. We describe the sonographic findings of a case of ductal carcinoma in axillary ectopic breast tissue.

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