37-year-old female had a small brownish skin tumor excised.
- Ill-defined intradermal tumor.
- The tumor is formed by bland interlacing spindle cells located in a matrix consisting of collagen fibers.
- The borders of the lesion are infiltrative; spindle cells extend into, but do not destroy the surrounding tissue.
- In addition, histiocytes with cytoplasmic vacuoles, small hemosiderin deposits and capillaries with thickened walls are found.
- The epidermis above the tumor is hyperplastic and hyperpigmented.
The tumor is benign in its nature despite its infiltrative growth pattern. Extensive local invasion does not occur.