Here are two images of CT scan of a person suffering from left Maxillary sinusitis. First Image depicts completely opacified maxillary sinus with adjacent ethmoid sinusits. He was treated with antibiotics, oral and topical steroids, decongestant nasal drops for six weeks. Second image shows complete resolution of sinus opacities with patent ostiomeatal complex.
So, it is essential to treat such cases medically for adequate length of time before deciding for surgery. After all Sinusitis is primarily a medical condition.
Attached is an image edited with BlackBerry Photo Editor Ultimate