Inflammation of the pterygoid sinus is mainly due to obstruction of the sinus orifice, which causes secretions in the pterygoid sinus to drain easily, resulting in inflammation in the pterygoid sinus or accumulation of pus in the pterygoid sinus. Many cases of pterygoid sinusitis are detected by head CT or head MRI. If only thickening of the mucous membrane of the pterygoid sinus is detected and the patient has no obvious symptoms, no special treatment is usually needed because most of this condition can resolve on its own. However, if the patient has significant headache or even changes in vision, further examination and treatment should be done. If a new organism is found in the nasal cavity and the new organism causes obstruction of the butterfly sinus, the nature of the new organism should also be determined, and if necessary, surgical treatment or pathology should be taken to clarify the diagnosis. If no neoplastic organisms are found in the nasal cavity, but a significant high-density shadow is found in the pterygoid sinus, surgical treatment should also be considered.