Regarding malignant testicular tumors,
1. 95% of malignant testicular tumors are of germ cell origin
2. Seminomas more often demonstrate calcifications compared to non-seminomatous tumors
3. Seminomas typically show well defined high signal mass on T2WI
4. Intratesticular calcification may be secondary to spontaneous regression of germ cell tumors
5. MRI usually differentiate seminomas from non-seminomatous germ cell tumors
Answers: T, F, F, T, F
Notes: 95% of malignant testicular tumors are of germ cell origin, in which seminomas are the most common type. Non-seminomatous germ cell tumors more often demonstrate calcifications, hemorrhage, fibrosis and cystic changes compared to seminomas. Germ cell tumors usually are isointense on T1 and hypointense on T2WI and it is not possible to differentiate seminomas from non-seminomatous lesions. Germ cell tumors may undergo spontaneous regression and may be seen as hypoechoic area or calcification
Reference: Kim W et al. US–MR Imaging Correlation in Pathologic Conditions of the Scrotum. RadioGraphics 2007;27:1239-1253
