Parvimonas micraorbital cellulitis complicated with cerebral venous thrombosis and mycotic aneurysm

Parvimonas micra 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 P. micra . We describe a rare case of P. micra 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.