Sinus from an accessory canal.
D000328:Adult; D003786:Dental Pulp Cavity / Q000002:abnormalities; D005260:Female; D006801:Humans; D007180:Incisor / Q000002:abnormalities; D010482:Periapical Abscess / Q000209:etiology*; D014071:Tooth Abnormalities / Q000150:complications*