Orbital Extension of Sinonasal Mucocele Presenting as Proptosis: A Report of Two Cases.

Sinonasal mucoceles are benign cystic lesions caused by obstruction of sinus drainage; however, they may progressively expand and erode surrounding bone, leading to orbital complications. We report two cases of sinonasal mucoceles with orbital extension presenting as proptosis. The first case involved a 34-year-old man presenting with acute proptosis, diplopia, and decreased visual acuity, with imaging revealing a frontoethmoidal lesion extending into the orbit. The second case involved a 43-year-old woman with progressive proptosis without visual impairment, also related to a frontoethmoidal mucocele. Management differed between the two cases, with spontaneous regression in the first and surgical treatment in the second, both resulting in favorable outcomes. These cases illustrate the variable clinical presentation of sinonasal mucoceles and highlight the importance of imaging in diagnosis and management. Early recognition and appropriate treatment are essential to prevent visual complications.