Cellular angiolipoma.

Three examples of cellular angiolipoma are presented. They occurred as part of multiple, occasionally painful, subcutaneous nodules on the extremities and trunk of healthy men. There was no familial tendency. Grossly, the cellular angiolipomas were small lesions, approximately 1 cm. Histologically, dense cellular angiomatous tissue comprised more than 95% of the lesions. Much of this component contained prominent spindle cells. Lesser degrees of involvement in the other subcutaneous nodules illustrated the continuum of histology between cellular angiolipomas and more typical angiolipomas. The differential diagnosis of cellular angiolipomas includes spindle cell lipoma, Kaposi's sarcoma, and other vascular tumors. The most important distinguishing features are encapsulation, intravascular fibrin thrombi, septation, association with other more typical angiolipomas, and occurrence in healthy individuals.