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Neurofibromas are benign nerve sheath tumours which occur in the dermis or subcutis with a variable distribution on the body surface. Accessory breast tissue results from incomplete involution of the embryologic mammary ridge. We report a case of a 63-year postmenopausal multiparous woman who presented to our department with a lump in the lower left abdominal quadrant near a supernumerary nipple. An abdominal ultrasound confirmed the presence of a 20mm mass and describes it as a hypo-anechoic neoformation below the accessory nipple in the context of likely breast parenchyma. A large local excision of the lesion was therefore planned. A final histologic diagnosis of neurofibroma arising in accessory breast tissue was made. This case report describes for the first time a case of a neurofibroma arising on ectopic breast tissue.
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