A missing tooth. The need for careful radiographic examination.
D000293:Adolescent; D003803:Dentigerous Cyst / Q000000981:diagnostic imaging*; D006801:Humans; D008297:Male; D008443:Maxillary Sinus / Q000000981:diagnostic imaging*; D010254:Paranasal Sinus Diseases / Q000000981:diagnostic imaging; D011859:Radiography; D014095:Tooth, Impacted / Q000000981:diagnostic imaging*