A Case of Encapsulated Fat Necrosis.

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  • 胸部に認められた多発性Ｅｎｃａｐｓｕｌａｔｅｄ　Ｆａｔ　Ｎｅｃｒｏｓｉｓ

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A case of encapsulated fat necrosis in a 37-year-old woman is herein reported. The patient had noticed small subcutaneous nodules on her left chest wall for six years. Eight extirpated nodules measured from 3 to 20mm in diameter. The largest one also adhered to the surrounding connective tissue. A histopathological examination revealed all the nodules to be encapsulated by thick collagenous capsules, while containing various degrees of fat degeneration including almost normal fatty tissue, coagulation necrosis, and other fat necrosis such as membranous, micro-and macro-cystic necrosis, in association with focal calcification and occasional inflammatory infiltrates. A great majority of the nodules occurred in the lower extremities, especially at friction sites, and hence traumatic stimuli might well have played an important role in the histogeneis. The term “encapsulated fat necrosis” is preferable to such previously used terms as “nodular-cystic fat necrosis”, “mobile encapsulated lipoma”, “posttraumatic fat degeneration and herniation”, “nodular fat necrosis”, and “encapsulated necrosis”, because this disease is not a lipoma but essentially represents fat necrosis, and can be both cystic and non-cystic, as well as both mobile and non-mobile.

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