Ganglioneuromatous paraganglioma of the cauda equina--a pathological case study.

This study presents a rare case of compound paraganglioma/ganglioneuroma with comprehensive immunohistochemical studies that reveal strong cytokeratin expression in all components. A 74-year-old woman presented with a mass lesion of the cauda equina. The 1.8-cm tumor showed 3 histomorphologically and immunohistochemically distinct components: typical paragangliomatous neuroendocrine areas, mature ganglion cell-like neuronal areas, and a "neuromatous" proliferation of Schwann cells with admixed axons. As often seen in cauda equina paragangliomas, the neuroendocrine cells were cytokeratin-positive. In addition, immunoreactivity for cytokeratins was also observed in the neurons and axons. This tumor illustrates the broad spectrum of divergent differentiation that can be seen in cells of sympathoadrenal lineage.