has part has part characteristic of part of inheres in part of has modifier Abnormal paranasal sinus morphology Abnormality of the paranasal (cranial) sinuses, which are air-filled spaces that are located within the bones of the skull and face and communicate with the nasal cavity. They comprise the maxillary sinuses, the frontal sinuses, the ethmoid sinuses, and the sphenoid sinuses. Abnormality of the paranasal sinuses UMLS:C4025873 HP:0000245 Abnormality of the sinuses Abnormality of the sinuses of the head Abnormality of the upper respiratory tract Abnormal facial skeleton morphology morphology abnormal paranasal sinus