Abstract
The patient was a thirteen-year-old boy whose chief complaint was the swelling of the left cheek (zygomatic region). An operation performed for the condition of which he complained revealed the following facts.
1. There was an absence of the anterior and mesial walls of the maxillary sinus and the prescence of three large polyps filling up the sinus.
2. The. presence of a large antrochoanal polyp rising from the canopy of the sinus walls and extending into the nose and the posterior nasal cavity was found.
3. This was probably an instance of one type of the so-called mucocele sinus maxillae, produced by three large polyps in the maxillary sin ls with thc: effect of sinuitis cum dilatatione.
