CT manifestations of primary yolk sac tumor / 中国医学影像技术

ABSTRACT

Objective To observe CT features of primary yolk sac tumor (YST).Methods Clinical data and CT findings of 31 patients with primary YST proved by pathology were analyzed retrospectively.Plain CT was performed in 31 patients,while contrast enhanced CT scanning was performed in 23 patients.Results The lesions in 19 patients located in the gonads,including ovaries (n=11) and testes (n=8).Other lesions in 12 patients located out of gonads,including sacrococcygeal region (n =7),anterior mediastinum (n =3) and vagina (n=2).The tumors were oval shaped in 20 patients,while irregular shaped in other 11 patients.Well-defined boundary was found in 20 patients,whereas ill-defined boundary was found in 11 patients.Fat and calcification were found in 2 patients with teratomas.Moderate to marked enhancement of the solid part of tumors were observed in 23 patients,loofahs enhancement were observed in 17 patients,the blood vessels were found in 18 patients,while delayed enhancement of coated edge was found in 21 patients.The rupture of tumor capsule was found in 4 patients.Conclusion CT manifestations of YST have certain characteristics,which can provide imaging diagnostic evidences.