Fig. 5.

Mid-power and high-power H&E stains (a & b respectively) demonstrate histopathology of the sacral mass with schwannian stroma composed of Schwann cells with elongated nuclei and tapered or pointed ends, with a collagenous and variably edematous background. There are also scattered large ganglion cells (blue arrow in b) with abundant amphophilic cytoplasm and distinct round nuclei with prominent nucleoli. The neurofilament stain shows strong positive reaction in the small nerve axons within the stroma and ganglion cells (c). The schwannian stroma and sustentacular cells surrounding the ganglion cell were positive for S100 (d).