Isolated frontal sinus aspergillosis treated by endoscopic modified Lothrop procedure.

Aspergillosis is a common fungal infection of the paranasal sinuses. Isolated frontal sinus aspergillosis is extremely rare, with only three cases reported in the literature. We report a case of isolated frontal sinus aspergillosis that was accompanied by a contralateral frontal sinus cyst enclosed osseously. The patient was treated successfully by an endoscopic modified Lothrop procedure that permitted complete removal of the fungus ball and wide opening of the frontal sinus. The patient is without evidence of disease 18 months after surgery.