Image Diagnosis: Frontoethmoidal Mucocele

A 34-year-old woman presented with 2 months of right-sided congestion associated with 1 month of an external swelling on the right side of her nose. On examination, there was a firm swelling just above the right medial canthus (Figure 1). The computed tomography scan revealed a smooth, well-defined ovoid homogenous mass expanding and obliterating the ethmoid cells on the right side, with extension into the frontal sinus and orbit and lateral displacement of the globe (Figure 2). A diagnosis of right frontoethmoid mucocele was made. The mucocele was drained and marsupialized under endoscopic guidance, and a postoperative biopsy confirmed the diagnosis (Figure 3). The patient was asymptomatic at 5-month follow-up