Cutaneous intramuscular lipoma: A new subtype of intramuscular lipoma

Intramuscular lipoma is an uncommon variant of lipoma that occurs inside muscle tissue. Pathogenesis is thought to be related to neoplastic activity of mesenchymal stem cells, but there still is not an established theory. This entity can be found in almost all areas of the body, mostly within or in connection with skeletal muscle tissue. We have encountered an atypical intramuscular lipoma located in the epidermal layer of the right thigh of an otherwise healthy 35-year-old female. The superficial, protruding skin mass resembled a sebaceous nevus or skin malignancy but was histologically composed of well-defined adipocytes between a mixture of muscle fibers, corresponding with the diagnosis of intramuscular lipoma. Intramuscular lipoma of the skin has never been reported before; thus, the authors suggest the classification “cutaneous” intramuscular lipoma to describe lesions located in the dermal or epidermal layer.

Pedunculated perianal lipoma: a rare presentation.

Lipomas are ubiquitous lesions. Most of the lipomas have a fibrous capsule and are divided into lobules by delicate septae. On gross examination and histological analysis, lipomas resemble mature fatty tissue. They are more compact on the cut surface than normal adipose tissue and the lobules are smaller on histological analysis. There is undoubtedly some physiologic difference between fat of lipoma and normal fat. Perianal lipomas are rare and may have deeper or interspincteric extensions. Preoperative evaluation to rule it out is a necessary part of the work up for any perianal lipoma. The case report is of a soft swelling on left side in the perianal region, which was investigated to rule out nature of the lesion or deeper and interspincteric extension. Case was managed by complete enucleation of the lipomatous swelling. Gross and microscopic examination of the surgical specimen revealed a perianal pedunculated lipoma.