Imaging of оvarian teratomas
- Yankova, G. Hadjidekov, Kr. Tzvetankov
Teratomas are the most common ovarian germ cell tumors, presenting a variety of histological aspects. They are often multicystic and contain sebaceous materials, calcifications, skin, hair and teeth. Most of them are asymptomatic and rarely manifest with abdominal pain. There are three main types of ovarian teratomas which are mature cystic teratomas (dermoid cysts), immature teratomas and monodermal teratomas (struma ovarii, carcinoid tumors and neural tumors). Most mature cystic teratomas can be diagnosed at ultrasonography (US) but may have a variety of appearances. Most typical is the persistance of echogenic sebaceous material and calcification. At computed tomography (CT) fat attenuation within a cyst is diagnostic. At magnetic resonance (MR) imaging the sebaceous component is specifically identified with fat saturation techniques. The US appearances of immature teratoma are nonspecific and CT and MR imaging is characterized by a large, irregular solid component containing coarse calcifications. Monodermal teratomas usually do not demonstrate fat. The US, CT and MR imaging features of ovarian teratomas can be very useful in differentiation and diagnosis.
Key words: TERATOMA TYPES. GERM CELL TUMORS. ULTRASONOGRAPHY. COMPUTED TOMOGRAPHY. MAGNETIC RESONANCE IMAGING