Figure 4. .

(A) The hematoxylin and eosin stained sections show a fragmented specimen comprising normal brain tissue (bottom half) and a moderately cellular proliferation of bland cells (upper half). These findings would fit for an expansile noninfiltrative growth pattern. (B) Immunohistochemical staining reveals reactivity of the lesional cells for inhibin A. (C) Oil-red-O staining on frozen tissue highlights the presence of cytoplasmic lipid droplets in the lesional stromal cells as a feature that is difficult to appreciate on the H&E stained section.