Osteoma orbitalis: A case report and literature systematic review

Orbital osteoma is a very rare benign tumor in orbit, and its diagnosis and treatment were certain particularity. Therefore, we reported one case of osteoma orbitalis and reviewed relevant literature, in order to further understand clinical features of osteoma orbitalis. A 38-year-old female was hospitalized due to left exophthalmos after frontal trauma for 5 years. Physical examination: left exophthalmos forward and laterally downward; a hard mass in the internal top of the eye sockets resulted in oppressive changes of ocular fundus. Movement of the left eye was slightly restricted. CT showed the bone-like mass while no findings were shown in MRI. Orbitotomy plus orbital tumor extirpation of the left eye were performed. Pathology indicated mature bone tissues, so osteoma orbitalis was considered. Systematic reviews of relevant literature showed that : the first case of osteoma orbitalis in China was reported in 1958, and a total of 40 cases have been reported up to now while a total of 47 cases have been reported since 1903 in Medline. Slightly higher incidence in females was found compared with males. The mean onset age was about 30 years old (27.04±10.8 years in China while 32 years old in foreign countries). The main clinical manifestations of osteoma orbitalis were as follows: exophthalmos (75%), fundus changes (60%), decreased vision (36.7%) and eye movement disorder (34%). Patient's systematic conditions and local non-orbital diseases were more overall reported in foreign literatures. The onset, clinical features and treatment of orbital tumors were special from other tumors, and the specificities should not be neglected.   Key words: Osteoma orbitalis, case report, literature systematic review.