[The clinical picture of paranasal sinus diseases and demands made by the ear, nose and throat physician on the radiologist].

We know today that chronic and recurrent sinusitis is caused by obstruction of the infundibulum in the anterior ethmoid bone. The primary goal of modern microscopic and endoscopic surgery for paranasal sinusitis by infundibulotomy is the restoration of ventilation and drainage of the sinuses. Meticulous radiographic delineation of the small structures of the hiatus semilunaris by computed tomography coupled with endoscopic evaluation is the most important diagnostic method. In the majority of cases the coronal plane is preferred. The axial plane is mandatory only for evaluation of the frontal sinuses.