Pneumosinus dilatans frontalis: Case report of a rare disease of the paranasal sinuses

Introduction Pneumosinus dilatans is characterized by an abnormal dilatation of air-filled paranasal sinuses. The disease mostly affects men between 20-40 years of age with involvement of the frontal sinus. The etiology and pathogenesis are largely unclear. The clinical symptoms can vary and usually manifest as cosmetic, neurological and ophthalmological symptoms.