The present of too th in dermoid cyst is reported frequently. We report here, one to the rarest
cas es of ovaria n cys ts in which located a well recognized maxillary bone cont ai ning five
well-formed teeth. It seems th at this is one of the rarest or may be the first reported case with
this level of differentiation in derm oid cyst.
Mature cyst ic teratoma, which is germ cell ovaria n tumor, includes more th an 20% of all
ovarian neoplasi sas. This is the most common ovarian tumor in pe di atric age group and e ar ly
reproductive years. Abouth one third of these tumors conti an tooth. Although there are many
examples of tooth in teratomas, the exact level of differentiation of fetal germinal layers in these
tumors is no t reported. Despite extensive searches in medical literature and re ferences , 'we
found no other case with this level of differentiation and it seems to be one of the rarest or the
first reported case in the history of medical researches, regarding differ entiation in dermoid cyst