Keywords: Mediastinal neoplasms, Teratoma, Mature cystic teratoma
[10,11] However, some studies reported mature cystic teratoma
as their most common lesion.
The neurologists felt a correlation between the neurologic symptoms of the patient and the cystic teratoma
, a rare paraneoplastic phenomenon from the teratoma, i.e.
These cystic lesions can be misdiagnosed as epidermoid cyst, cystic teratoma
, hemangioma, branchial cyst, trichilemmal cyst, lymphadenopathy, sebaceous cyst, subperiosteal abscess, or hematoma.
Central primary primitive neuroectodermal tumor (cPNET) arising from an ovarian mature cystic teratoma
in pregnancy: A case report and review of medical literature.
In the vast majority of cases, it cannot be preoperatively differentiated from mature cystic teratoma
without fatty tissue, cystadenoma or cystadenocarcinoma, endometriosis, tuboovarian abscess or metastatic tumors (8).
The mature cystic teratoma
is the most common type, forming 8-15% bilateral, but few cases were reported as bilateral and multiple.
We report an unusual case of a retroperitoneal mature cystic teratoma
Transvaginal ultrasonography revealed a 5-cm swollen right ovary, which was suspected to be a mature cystic teratoma
, and the absence of ascites at the Douglas' pouch.
A diagnosis of ovarian cystic teratoma
with primary invasive urothelial carcinoma (TNM stage pT1aNxMx) was made based on the Pathological Stage Classification by the American Joint Committee on Cancer (AJCC) 8th edition .
Ultrasound can detect an intratesticular multicystic mass, and the normal testicular parenchyma can be evaluated when the clinical diagnosis suggests a cystic teratoma
 The association of mature cystic teratoma
with contralateral serous cystadenoma is uncommon.