Primary retroperitoneal teratomas are rare entities that represent <12% of all primary retroperitoneal tumors. In addition, <20% of these lesions occur in adults.
Primary retroperitoneal teratomas develop from germ cells that fail to migrate to their normal gonadal location. Once formed, these lesions may be solid or cystic and commonly contain mature tissues (i.e., teeth, skin, fat, cartilage, bone).
Primary retroperitoneal teratomas can be benign or malignant, and the malignant type more commonly affects adults. On CT, teratomas are usually heterogeneous, well-defined, solid, or multiloculated cystic lesions that may contain calcifications, bony elements, teeth, protein, and fat. A fat-fluid level with nondependent fat layer is virtually pathognomonic of a teratoma.
Imaging is helpful for surgical planning, especially anatomical relationships with adjacent abdominal viscera. Laboratory values can be helpful as alpha-fetoprotein levels are normal in the benign type and can be elevated in the malignant type. Benign lesions have an excellent prognosis if surgically excised, whereas malignant lesions frequently recur with <2 years survival after surgery.
FROM：
https://radiologykey.com/genitourinary-radiology/
word
單詞表
Notes:
1. retroperitoneal [ˌretroʊˌperɪtn'i:əl] adj. 腹膜後的
2. teratoma [ˌterə'toʊmə] n. 畸胎瘤
3. germ [dʒɜ:rm] n. 微生物; [生] 幼芽
germ cell 生殖細胞
4. gonadal ['gɒnædl] 性腺
5. multiloculated [mʌltaɪ'loʊkjʊleɪtɪd] 多房的，多腔的
6. calcification [ˌkælsɪfɪ'keɪʃn] n. 鈣化
7. pathognomonic [pəˌθɒgnə'mɒnɪk] adj. 特殊（病徵）的，特定的，（病徵）能確定診斷的
8. anatomical [ˌænəˈtɑmɪkəl] adj. 結構（上）的，解剖的
9. viscera [ˈvɪsərə] n. 臟器
10. alpha-fetoprotein ['ælfəfet'ɒproʊti:n] AFP 甲胎蛋白，甲種胎兒球蛋白
內容版權歸屬【每天朗讀一段醫學影像學英語文章小打卡團隊】
圈子介紹
1、打卡實名制，申請加入請註明姓名+單位+科室，或姓名+學校+專業+年級 ;
2、請朗讀每日發布的醫學影像學英語文章，亦可自選段落 ;
3、歡迎加管理員好友（妙然：18883938655 ），或報名加入管理員 ;
4、歡迎提供推薦閱讀和聽力口語材料 ;
5、歡迎意見建議;