[45] INI-1 deficient sinonasal carcinoma shows loss of INI-1 IHC expression in 100% of cases along with 100% of renal medullary carcinomas and 98% of malignant rhabdoid tumours of the kidney, soft tissue, and CNS so while not entirely specific can help guide diagnosis. Here, SMARCB1 is linked to nasal cavity and paranasal sinus carcinoma.