：The infratemporal fossa is a space surrounded by bones, and is a difficult place for clinical diagnosis of lesions and surgical approach. Infratemporal fossa abscess is a relatively rare disease, and despite the fact that its cause is often a dental infection, there are few reports in the field of oral surgery. We report a case of infratemporal abscess due to inflammation of

：Thyroglossal duct cyst is a congenital cyst derived from epithelial remnants of the thyroglossal duct of the fetus and occurs between the foramen cecal of the tongue and the thyroid gland, though it rarely arises in the oral cavity. We