Endoscopy is now being used for diagnosis and surgical treatment of disorders of the nose and paranasal sinuses. Accessory ostium exists at the 25-30% of the general population instead of the natural ostium. There are some features that differentiate the accessory ostium and natural ostium. To determine the incidence and location of the accessory ostium 29 fromaldehyde fixed adult cadaver was examined with endoscope. The accessory ostium is encountered at 8 cases (13.8%). These are located at rare-middle, front-middle and rear in 2 (0.03%), 3 (0.05%), 3 (0.05%) cases respectively. Recognition of the maxillary ostia is tedious while performing endoscopic procedures which accounts for a high rate of orbital complications for a novice performing surgery in this region.
It is therefore imperative to know the landmarks in this regions which may be obliterated by disease. Radiologist should be aware of this entity as it can appear as communication between the maxillary sinus and nasal cavity on sinus imaging examinations.
It is suggested that remarkable anatomic variations of paranasal sinus and their pathologic consequences should be well-defined in order to improve the success rate of management strategies. In order to avoid potential complications of sinus surgery, the radiologist must pay close attention to anatomical variations in preoperative evaluationsDr. erenogut, PhD