1 INTRODUCTION
Torus is a common benign exostosis of the jaw bones that develops in about 10-30% of the world population.1-5 This pathologic condition is usually manifested around the age of puberty and continues to grow during adulthood. These lesions appear as lobulated protuberances on the lingual side of the jaws or hard palate. Most of them are asymptomatic and first noticed by the patients or detected incidentally by the dentists. However, large tori are often subject to traumatic mucosal inflammation and ulceration, as well as a wide spectrum of other complications that are described in this article. There are also instances when the patients seek advice from their primary care physician because of concern that an enlarging or ulcerated torus may represent an oral malignancy. Such cases can pose as a diagnostic challenge to the practicing clinicians who may not be well-informed about the appearance and potential implications of this abnormality.