label: Abnormal paranasal sinus morphology
label_lc: abnormal paranasal sinus morphology
description: "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."