CT scan of the sinuses covers the nasal cavity and sinuses, consisting of soft tissues and bony structures, and the cavity contains gas, which is most suitable for CT examination. CT diagnosis of the nose and sinuses is of greater value and is a better indicator for the diagnosis of acute and chronic sinusitis. The fluid plane or soft tissue density shadow in each group of sinuses can be seen, which can clearly show the extent of sinusitis, clearly show the fine structure of each sinus and its adjacent area, and also detect smaller tumors and determine their scope and origin. Benign tumors show uniform density of the mass, neat borders and no bony destruction. In contrast, malignant tumors show uneven mass density, poorly defined borders, bony destruction of the sinus wall, and invasion into adjacent tissue structures, such as the nasal cavity and orbit, as well as the extent of invasion, usually with significant enhancement effects. ct can also take into account the soft tissue window and bone, and detect fluid plane calcification and necrotic lesions to distinguish tumorigenic lesions from inflammatory lesions, etc.