Table 1.

Clinicopathological features of the SNUC cases

Case No.	Age (years)	Sex	Signs and symptoms	Imaging findings	Histomorphological features	Treatment & follow up
1	40	F	Right sided nasal mass	Nasal mass with intracranial extension	Papillary pattern, perivascular arrangement, basaloid morphology, necrosis	NA
2	38	M	Swelling below left orbit	Mass in the maxillary sinus with extension into inferior orbital wall and infra-temporal fossa	Sheets of large cells with moderate cytoplasm, vesicular nucleus & conspicuous nucleoli	NA
3	17	M	Nasal mass with left cervical LN	CECT face and neck-large heterogeneously enhancing infiltrative soft tissue lesion centred in left nasopharynx, pterygo-maxillary space, left hemisphenoid, parasellar, paraclival region & left maxillary antrum	Diffuse infiltrative pattern, Trabecular and cords of tumor cells, small cell carcinoma like pattern	No surgery, treated with chemo & radiotherapy DOD, 3 months after the biopsy diagnosis
4	27	M	Right sided nasal mass of 2-year duration	CECT–small polypoidal enhancing lesion extending from anterior aspect of inferior turbinate with contiguous extension to lateral nasal wall	Diffuse and nest like patterns, sarcomatoid areas, focal rhabdoid morphology	WLE of the mass. Alive without any recurrence (2 years duration)
5	33	M	Right sided polypoidal nasal mass	NA	Single cells, small nest, sheets of tumor cells variable amount of cytoplasm, round vesicular nucleus and prominent nucleoli, lymphoma like morphology	NA
6	50	M	Left nasal obstruction, bleeds on touch	NA	Nest of large tumor cells with moderate amount of cytoplasm, round nuclei & conspicuous nucleoli	Treatment details were not available. DOD, 1 year after the diagnosis

SNUC sinonasal undifferentiated carcinoma, SDSC SMARCB1/INI1 deficient sinonasal carcinoma, NA not available, DOD died of diseases, WLE wide local excision