Sinolith: a rare isolated sphenoid sinus lesion.

Sinolith is a calculus in the paranasal sinuses. It has been also known as antrolith, rhinolith, antral calculi, antral stone, or antral rhinolith. The pathogenesis of calculi formation within a paranasal sinus is still not known. Chronic infection, foreign material, poorly draining sinus, and fungal infection are the main predisposing factors. Isolated sphenoid sinus lesions are rare, and most of them are inflammatory diseases. The main symptom of sphenoid sinus lesions is headache. Headache may be the only symptom of sphenoid sinus lesions. Sinolith is mostly encountered in the maxillary sinus followed by the frontal sinus and the ethmoid sinus. There was only 1 publication about sinolith localized in the sphenoid sinus in the English language literature. We report a case of an isolated sinolith localized in the sphenoid sinus. The treatment of choice should be surgical removal of the sinolith. Endoscopic surgery especially through the transnasal route should be the first-choice surgical treatment of isolated sphenoid sinus lesions.