MATURE CYSTIC TERATOMA OF RIGHT OVARY

Ovarian teratoma is a common ovarian tumor,accounting for 20% of adult ovarian tumors and 50% of pediatric ovarian tumors.Teratomas consist of a number of histologic types of tumors containing mature or immature tissue of the three germ cell layers,including the ectoderm,mesoderm,and endoderm (1). The clinical manifestations of ovarian teratomas vary from incidentally detected small masses to malignantly transformed tumors leading to high mortality  Although the imaging findings of ovarian teratomas also vary from purely cystic masses to mainly solid masses,ovarian teratomas can be readily detected and diagnosed by identifying the intratumoral fat at computed tomography and magnetic resonance imaging (2).The typical imaging finding of an ovarian teratoma is a cystic mass with intratumoral fat (3). 12% of these tumors are bilateral and 20% have no fat. The growth rate of these tumors is about 1.8mm per year.

main complication of these tumors is their association with ovarian torsion. Additionally they can rupture. Less than 1% can develop squamous carcinoma secondary to metaplasia in the Rokintansky Nodule.

Sonography is the first line imaging for diagnosing mature cystic teratoma. 

Sonographic features of mature cystic ovarian teratoma include:

 

•Cystic lesion with a densely echogenic tubercle (RokintanskyNodule) •Diffusely or partially echogenic mass with echogenic area usually demonstrating sound attenuation. •Multiple thin echogenic bands caused by hair in the cyst.

• These Sonographic  criteria have 58% sensitivity and 99% specificity