Encapsulated fat necrosis: a case of 'thigh mouse'.

Encapsulated fat necrosis is a rare condition with clinical features that closely resemble a lipoma. The aetiology and pathogenesis are not fully understood but the condition has a distinctive histological appearance. We describe a case of encapsulated fat necrosis that exhibited unusual mobility. The literature is also reviewed. Copyright 2001 The British Association of Plastic Surgeons.