ANTROCHOANAL POLYP
Nasal polyposis is an inflammatory condition of unknown etiology. Nasal polyps are the most common tumors of the nasal cavity. Approximately 30% of patients with nasal polyps test positive for environmental allergies. Nasal polyposis results from chronic inflammation of the nasal and sinus mucous membranes. Chronic inflammation causes a reactive hyperplasia of the intranasal mucosal membrane, which results in the formation of polyps.
Radiography with Waters views may show opacification of the sinuses. Coronal sinus CT is the imaging study of choice in the evaluation of patients with nasal polyposis. Coronal CT of the paranasal sinuses is best for delineating the underlying pathology, the extent of disease, and possible bony destruction. Nonenhanced CT with 2- to 3-mm sections helps to delineate the location and origin of the visible polyps, evaluate the underlying condition of all of the sinuses, and assess the anatomy of the paranasal sinuses in the event of surgical intervention.