What is the term for a mucocele in the sinus?

The term specifically used for a mucocele that forms in the sinus is indeed "mucocele." A mucocele is a cyst-like formation that contains mucus and arises from the blockage of mucous glands, leading to accumulation in a sinus. This term is universally recognized in medical terminology for such mucus-filled lesions in the sinus cavities.

Other terms like "polyp" refer to benign growths that are typically associated with inflammation or irritation but do not specifically denote mucus accumulation. "Oral cyst" implies a cyst located in the oral cavity rather than the sinus, and "fibroma" suggests a benign tumor made up of fibrous tissue, which is not related to mucus accumulation in the context of sinuses. Therefore, the most accurate and appropriate term for a mucocele in the sinus is indeed mucocele, as it directly describes the condition without ambiguity.