The most important infectious diseases of the orbit and its attachments are orbital cellulites preseptal and post-septal. The origin of which is secondary to a process of the skin or sine paranasal about 60% arise as a result of the maxillary sinus or ethmoid above. In addition to the source can also be hematogenous. According to Chandler, classified as: I. pre-septal cellulites, II. Orbital cellulites, III. Periorbital abscess, IV. Orbital abscess,. Sinuscavernous thrombosis. The pediatric population is most affected. Patient 13 years old, male, admitted with a pre-hospital proptosis and pain in his left eye with 10 days of development, previously healthy or local trauma, treated with amoxicillin with development numb. If aggregates eyelid ptosis, epiphora and decreased visual acuity on the affected side by that given in our service. Physical examination was found left eye with palpebral ptosis, ocular proptosis, conjunctival injection, chemosis, mydriasis unreactive, blindness, ocular motility block. Cranial pairs, II, III, IV and VI abolished. CT is performed where it notes hypodensity 1.5 cm x 2.5 cm in the left orbit, in contact with the inner wall, homogeneous boundary liquid / clear / clear, hypertrophic mucosa of the paranasal sinuses ethmoid, maxillary and sphenoid left. FESS is performed with drainage of the abscess by endoscopic and antibiotic coverage with Ceftriaxone. Patient overcomes the infection as a sequel though, remains with amaurosis of the affected eye.