RESUMO
Immature teratomas are usually derived from a malignant transformation of mature teratoma. The pure immature teratoma accounts for less than 1% of all ovarian cancers. It is the second most common germ cell malignancy and accounts for 10-20% of all ovarian malignancies seen in women younger than 20 years of age. Extragonadal origin are extremely rare and the most common extragonadal site of these teratomas is the omentum. We hereby describe a case report of a 29-year-old lady who presented with abdominal pain and her imaging with an ultrasound revealed a mass with features suggestive of a subserosal fibroid. She underwent a laproscopic myomectomy. A histopathologic diagnosis of Immature teratoma was made following her primary surgery. She subsequently underwent a staging laparotomy which was followed by chemotherapy. Immature teratomas predominantly occur in young patients, and preservation of fertility is an important factor in its management. Treatment should be initiated as soon as possible after surgery, preferably within 7-10 days, in those patients who require chemotherapy.