OBJECTIVE: To report a case of odontogenic cyst in the right maxillary sinus and its surgical management. CASE REPORT: M.G.P. C, 54 years old, female, native from Rio de Janeiro, seeking private hospital outpatient clinic, reporting pain and swelling in the right maxillary region, with a history of three similar episodes in the last three months. Reported on dental history handling element 17, is 04 months. It was prompted endoscopy and computed tomography of the paranasal sinuses. Endoscopy showed no changes and computed tomography revealed nodular formation in the right maxillary sinus with a soft tissue mass measuring 2.7 x 2.4 x 1.7 cm and limiting peripheral linearly. The lesion determines bone remodeling of the maxillary bone in continuity with the base of the lesion and communication with the root of the tooth in the jaw 17 on the maxilla. In front of the clinical and radiological evidence, was suspected odontogenic cyst and the patient were proposed for the removal of the lesion by external access and incision of Neumann. Patient had no postoperative and radiological complaints without evidence of recurrence of the cystic lesion. CONCLUSION: Odontogenic cysts arise from the proliferation of epithelial remnants through the inflammatory process associated with the formation of teeth. In most cases your treatment, and management is expectant, depending on the symptoms but the best option is surgical treatment as described.