Biphenotypic sinonasal sarcoma in a toddler: a case report and literature review.

Introduction: Biphenotypic sinonasal sarcoma (BSNS) is an extremely rare malignant tumor characterized by neural and myogenic differentiation. No documented cases of BSNS have been reported in toddlers.

Case Report: A 1-year-11-month-old girl presented with significant unilateral nasal bleeding.