Slow-growing, pedunculated mass on lower lip that had developed over a period of four months. Mass was surgically removed as it had started to ulcerate. Mass has not reappeared since resection six months ago. Pedunculated mass approximately 1.5 x 2.0 cm on lower lip, composed of firm tissue covered by red ulcerated surface. The mass is composed of a subcutaneous infiltration of mononuclear cells with a variety of morphologies covered by an ulcerated epithelial surface.
Some cells resemble lymphocytes with dense round basophilic nuclei and little cytoplasm.
This cell type is most common in the 'stalk' of the mass. Most cells have a larger more open nucleus surrounded by eosinophilic faintly vacuolated cytoplasm and resemble histiocytes. In addition, there are very large cells composed of similar cytoplasm but which have large abnormally shaped nuclei. These nuclei were often eccentrically placed and had a crescentic form. Some of these cells appeared to be multinucleated but this was interpreted as plane of section effect due to their very abnormal shape.