Although mucocele of the paranasal sinuses is rather common, it is rarely seen in maxillary sinuses. If the maxillary sinus is involved, it is presented with destruction of the sinus wall, swelling of the cheek, swelling of the g i ngivobuccal sinus, expansion to the inferior wall of the orbit, and ophtalmic presentation. In this case report a rare and noticeable case with maxillary sinus mucocele is presented. The case was first diagnosed with suspicious sinus malignancy based on CT scan but during the surgery the cyst was found to be a mucocele.