An Endoscopic Endonasal Approach for Early-Stage Olfactory Neuroblastoma: An Evaluation of 2 Cases with Minireview of Literature

Figure 3

Pathological findings in case 1. Hematoxylin-eosin staining revealed a nest-like tumor mass under the mucosa. The tumor cells showed monotonous growth. Based on infrequent anisokaryosis and mitotic figures, the tumor was diagnosed as an ONB, Hyams’s stage I-II.