<i>Parvimonas micra</i> orbital cellulitis complicated with cerebral venous thrombosis and mycotic aneurysm

<i>Parvimonas micra</i> is a gram-positive anaerobic coccus typically found in the human oral cavity, upper respiratory tract and gastrointestinal system. It occasionally causes intra-abdominal abscesses, spondylodiscitis and other infections. There are very few case reports on mycotic aneurysm related to <i>P. micra</i> We describe a rare case of <i>P. micra</i> orbital cellulitis complicated with meningitis, cerebral venous thrombosis and internal carotid artery mycotic aneurysm, which was successfully treated with the combination of endovascular therapy and antibiotics. Additionally, the patient received 6 months of anticoagulation therapy for cerebral venous thrombosis.