This report aims to present the case of a 21 year old boy with oroantral communication associated with sinonasal symptom. The aetiology was the presence of ectopic third molar in the sinus. Closure of the communication and surgical removal of the tooth via Caldwell-Luc procedure resulted in resolution of the symptoms. The oroantral communication was surprisingly caused by the chronic sinusitis resulting from the presence of the tooth in the maxillary sinus. Keywords: oroantral communication, maxillary sinus, ectopic maxillary third mola
