Deformity of the nasal septum can also result in enlarged turbinates. The main anatomic defect in TOF is the anterior deviation of the pulmonary outflow septum. Vaginal atresia and a transverse vaginal septum require differentiation. The nasal cavity is divided in two by the vertical nasal septum. A septoplasty is the specific surgery to correct a nasal septum deviation. Nose piercings are also common, such as in the nostril, septum, or bridge. One case of rhinotillexomania resulted in perforation of the nasal septum and self-induced ethmoidectomy. The lateral ventricles sit on either side of the septum. Hippocrates described the heart as having two ventricles connected by an interventricular septum. Gallbladders with two lobes separated by a septum may also exist. This can be caused by a deviated septum as well as a viral infection. Orbital cellulitis is inflammation of eye tissues behind the orbital septum. Involvement of the ventricular septum is rare. Uterus didelphys is often confused with a complete uterine septum. The nostrils are separated by the septum.