Fig. 8From: A rare serious case of retroperitoneal paraganglioma misdiagnosed as duodenal gastrointestinal stromal tumor: a case reporta,b H&E stain: Nests of round to polygonal tumor cells (Zellballen pattern), with central nuclei, nuclear atypia and eosinophilic cytoplasm which predicates the diagnosis of paraganglioma.Back to article page