Spindle Cell Lipoma : Microscopic
Microscopic Features: The spindle cells are arranged in short, parallel fascicles in a myxoid matrix often containing collagen fiber bundles. There may be prominent nuclear palisading, similar to that seen in schwannomas. Some tumors are sparsely cellular and contain abundant myxoid matrix, mimicking a myxoma. The background matrix contains numerous mast cells. Foci of osseous or cartilaginous metaplasia may be present.