CONTEXT: Supernumerary breast tissue may be affected by the same diseases and alterations that compromise topical breast tissue. Nevertheless, reports of fibroadenoma in supernumerary breast tissue in the axillae are rare. OBJECTIVE: To describe a case of fibroadenoma in an axillary supernumerary breast. DESIGN: Case report. CASE REPORT: A 39-year-old woman was referred to the gynecology and obstetrics outpatient clinic at Hospital Estadual Sumaré, complaining of bilateral axillary masses. The patient reported cosmetic problems and local pain and discomfort. On physical examination, alterations compatible with bilateral axillary accessory breasts, without palpable nodules, were observed. Supplementary examinations (mammography and ultrasonography) revealed a 1.1 cm mass in the right axillary breast. The patient underwent resection of the supernumerary breasts and histopathological examination revealed fibroadenoma of the right axillary breast tissue.

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A 26-year-old woman presented with a 4-month history of right breast lump. Clinical examination revealed a mobile, painless, 2.0 cm mass in the right breast. No alterations were found in the left breast. The axillae and nipples had no abnormalities. The patient had no other masses on her body. Ultrasonography detected an oval nodule with circumscribed margins in the right breast measuring 2.2 cm × 1.0 cm (Fig. 1). The patient underwent resection of the mass and a cystic lesion was found.Microscopic examination revealed a cystic cavity containing larvae, consistent with cysticerci (Fig. 2). Following histopathologic diagnosis, the patient had a brain computed tomography (CT) scan and stool examination for ova and parasites, which demonstrated no alterations.Parasitic infestation with the larval stage of the pork tapeworm ( Cysticercus cellulosae ) is called cysticercosis. Human infection is acquired by ingestion of tapeworm eggs through contaminated food and water supplies or hands improperly washed after a bowel movement. Reports of breast cysticercosis are rare in the literature. The diagnosis is usually made incidentally and there is no clinical suspicion of the infection. Another subsidiary examination is fine-needle aspiration cytology of the breast. Therapy includes surgical resection of the cyst. Drug treatment should be reserved for cases in which other foci of cysticercosis are found. Figure 1. Oval nodule measuring 2.2 cm × 1.0 cm with circumscribed margins, hypoechoic homogeneous content, and posterior enhancement.Figure 2. Histopathologic aspect of the cysticerci. Larvae are inside the cystic cavity surrounded by a membrane (hematoxylin-eosin, magnification ×40).