Since paranasal sinuses are anatomically adjoining to the orbit, various sinusal diseases are apt to cause ophthalmic pymptoms. We experienced two cases of orbital cellulitis which appeared to be originated from paranasal sinusitis. The first patient was a 28-year-old man who had progressive exophthalmos and disturbance of ocular movements with reduction in visual acuity. For these disturbances emergency operation was considered necessary. Palpebral vertebra was incised to remove pus, and drainage was carried out. The second patient was a 57-year-old man. Although his ocular symptoms and roentgenographic findings were mild in nature, it was considered desirable to examine the paranasal sinuses grossly and extranasal frontonasal sinustomy was carried out.
