en پژوهشي اصیل Original Research <p>This is a report of a case with unilateral cavernous sinus thrombosis due to ipsilateral ethmoid sinusitis.</p> <p>A 10 year old female was admitted in our hospital with severe headache, purulent postnasal discharge, right eye proptosis and third cranial nerve palsy in the same eye. She had history of viral upper respiratory tract infection and then acute otitis media which did not improve with routine medications. Head imaging showed ethmoid sinusitis and cavernous sinus thrombosis. Clinical manifestation was subsided after thirty days aggressive antimicrobial and anticoagulant therapy.</p> <p>Ethmoid sinusitis can cause cavernous sinus thrombosis. Appropriate management by antibiotic and anticoagulant therapy can prevent neurologic complications and death</p> Cavernous sinus thrombosis, Sinusitis, Proptosis 18 20 http://ijca.iums.ac.ir/browse.php?a_code=A-10-1-28&slc_lang=en&sid=1 Zohreh Kalbassi z_kalbassi@yahoo.com 1003194753284600168 1003194753284600168 No Ali-Asghar Children’s Hospital Ladan Afsharkhas dr.afsharkhas1@yahoo.com 1003194753284600169 1003194753284600169 Yes Alireza Alavi alireza.alavi1358@yahoo.com 1003194753284600170 1003194753284600170 No