sino-nasal malignancies, paranasal sinuses, PNS, nasal cavity, rarity, air/soft tissues, mucosa/bone, RT contouring, RT planning, SNUC, sinonasal undifferentiated carcinoma, maxilla, ethmoid sinus, perineural spread, salivary gland tumors, lymphatic and distant spread, risk factors, papillomavirus, biopsy, staging evaluation, ancillary services, intracranial invasion, orbital invasion, sinonasal malignancy, ENB, Ohngren's line, treatment modality, management schema, SNEC, differentiation, subtype, CFR, margin status, target delineation, pre-treatment imaging, intraoperative findings, pathological findings, elective nodal irradiation, ENI, SNSCC, sinonasal squamous cell carcinoma, IMRT, image guidance, late ocular toxicity, diagnostic endoscopy, dose distribution, photons, patterns and distribution of failure, prognostic factors, carbon ion radiation therapy, concurrent chemotherapy, NACT in ITAC, intestinal-type adenocarcinoma, induction chemotherapy, neoadjuvant chemotherapy, chemotherapy regimens, actionable mutation, post-treatment PET-CT