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Adenolipoma of the breast is a rare benign tumor. Three cases of adenolipoma of the breast are presented, with a review of the literature. Case 1 was a 57-year-old woman who had a soft, well-circumscribed mass in the right breast, measuring 13×12cm in diameter. Mammography showed an oval radiolucent shadow with well defined low or iso-echogenic lesion with strong internal echoes and smooth margin. The tumor was encapsulated, and 14×12×3.5cm (390g) in size. It consisted of fatty tissues containing focal areas of grayish-white breast tissues. Histological findings indicated an adenolipoma. Case 2 was a 44-year-old woman (2.0×1.2×1.0cm), and case 4, a 52-year-old woman (4.5×2.5×1.3cm). These cases showed the same pathological features as case 1. Only 13 cases including these 3 cases have been reported in Japan. The adenolipoma of the breast were reviewed and discussed the clinicopathologic aspects and the histogenesis.

A case of giant lipoma of the right breast in a 27-year-old woman is reported. She had noticed a right breast mass 10 years earlier. The mass enlarged slowly and exceeded child head size when she admitted to the hospital. The right breast hanged down to the lumbar level. A soft, movable, well-circumscribed tumor measuring 25×25cm in diameter was detected in her right breast. No only clinical findings but also mammography (MMG), computed tomography (CT) and magnetic resonance imaging (MRI) indicated a giant lipoma of the breast and the tumor resected. The resected was well encapsulated, and 27×24×4.5cm (2675g) in size. The section showed segmental and yellow color like fat. Histological diagnosis was lipoma. The giant lipoma of the breast was reviewed and discussed the clinicopathologic differences from liposarcoma or adenolipoma of the breast.

Two cases of mammary adenolipoma successfully diagnosed by ultrasonography are reported, together with a review of the literature. Case 1 was a 49-year-old housewife complaining of a left mammary mass. In the left mammary ABE resion, an elastic, soft, smooth surface mass was palpated, and extirpation was carried out under a diagnosis of lipoma. The extirpated tumor measured about 7×5×3.5cm was egg-shaped, having a surface covered with thin capsule, a light yellow outside, and a cross section in which white net portions like mammry tissues were found here and there among yellow adipose tissues. Case 2 was a 61-year-old housewife who was found to have a right mammary mass at medical examination for breast cancer. An elastic tumor with smooth surface in the right mammary BD resion was expirpated under a diagnosis of adenolipoma. The extirpated tumor, 3×2.8×1, was oval and had a surface covered with thin capsule the same as case 1, and white portions which seemed like mammary tissues was mixed among adipose tissues. Ultrasonography visualized these tumors as hyperechoically well-defined but innerechoically unequal masses, which might be reflected a variety of the unequal acoustic feature of tumor tissues.