Fig. 4.

The histomorphology of case 2-SMARCB1/INI1 deficient sinonasal carcinoma showing a diffuse sheets of tumor cells with geographic areas on necrosis. (Hematoxylin and Eosin,  40 ×), b, c perivascular arrangement of tumor cells (Hematoxylin and Eosin, 200 ×), d, e The tumor cells were small to intermediate sized with high N/C ratio, vesicular chromatin, and prominent nucleoli (Hematoxylin and Eosin, 400 ×), f Complete loss of INI1 protein in tumor cells with positive internal control (immunostain, 400 ×)