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WHO Classification of Tumours
Lipoma, NOS
Connective, subcutaneous and other soft tissues


Definition

Lipoma is the most common soft tissue tumour in adults. It is a benign neoplasm composed of mature white adipocytes. Tumours can originate from subcutaneous tissue (superficial lipomas), from deep soft tissue (deep lipomas), or from the surface of bone (parosteal lipomas). Tumours are generally well circumscribed; as a rule, superficial lipomas are smaller (<5cm) than the deep seated ones (>5cm). Occasionally, areas of bone formation (osteolipoma), cartilage (chondrolipoma), abundant fibrous tissue (fibrolipoma), or extensive myxoid change (myxolipoma) can be observed within the tumours
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Fletcher CDM, Unni KK, Mertens F (Eds.)
World Health Organization Classification of Tumours. Pathology and Genetics of Tumours of Soft Tissue and Bone.
3rd Edition
IARC Press: Lyon 2002



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Lipoma manisfests most commonly in adults 40 to 60 years of age and is more frequent in obese individuals. Surgical resection is usually curative. Infiltrating intramuscular lipomas show a higher local recurrence rate; total removal of the involved muscle or a compartmental resection is suggested in these cases

Click for details
Fletcher CDM, Unni KK, Mertens F (Eds.)
World Health Organization Classification of Tumours. Pathology and Genetics of Tumours of Soft Tissue and Bone.
3rd Edition
IARC Press: Lyon 2002



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