What are some reasons why you might need surgery and a catscan on the sinuses?

Several reasons: Though I am not an ENT (Ear Nose Throat) doctor, the panoramic x-rays I commonly get as an oral surgeon can reveal masses in the maxillary sinus. Abnormalities of these sinuses can range from a benign collection of mucus to chronic sinusitis to a malignant growth. The CT will give him a better look; if it looks suspicious, the surgeon may need to explore the sinus to biopsy/remove the lesion.