This article reports a case of an asymptomatic, ill-defined radiolucency in the anterior mandible in the region of the central and lateral incisor teeth, found on routine roentgenographic examination. A labial mucoperiosteal flap was raised under local anesthesia. A portion of the lingual plate and inferior border of the anterior mandible were missing, and the space was occupied by the sublingual gland extension. The entrapped sublingual gland was removed and the histological diagnosis confirmed. The mucoperiosteal flap was sutured back in position. Healing was uneventful.