iatrogenic transposition of the parotid duct into the maxillary sinus after tooth extraction and closure of an oroantral fistula a case report case report we report the clinical course of a patient with a rare iatrogenic surgical complication of transposition of the parotid duct into the maxillary sinus after tooth extractiondiscussion oroantral fistula occurs most frequently following maxillary molar or premolar extraction closure of an oroantral fistula is frequently closed using the buccal mucoperiosteal flap first described by rehrmann in 1936 transposition of the parotid duct is a rare surgical complication of this techniqueconclusion differential diagnosis of nonspecific discharge from the nose should take this rare cause into account as it is a common symptom of this complication a careful and full patient history and the correlation of nasal secretion with food intake can lead to the diagnosis