Atypical lipoma

► Liposarcoma

Definition

Benign melanocytic growth, possibly sharing some of the clinical or microscopic features of melanoma, but not a melanoma

Pathogenesis

Genetic component in some patients (melanoma-prone families; familial atypical mole syndrome); sunlight exposure possibly a factor

Clinical manifestation

Variable features, with some or all of the following: asymmetrical conformation; irregular border which can fade imperceptibly into the surrounding skin; variable coloration, with shades of tan, brown, black; and red; diameter > 6 mm; elevated center and feathered, flat border, giving the lesion the appearance of a fried egg

Differential diagnosis

Melanoma; compound nevus; keratosis; dermatofibroma; wart seborrheic

Atypical lipomatous tumors

► Liposarcoma

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