Figure 15a. Cystic lymph node mass simulating an adnexal mass. CT scans show a large cystic mass between the uterus and the left pelvic sidewall. The mass was determined to be a lymph node mass (LN) because of its effacement and obscuration of the external iliac vein (EIV) and its location lateral to the ureter, which was visualized on images obtained at higher levels. These findings indicate an extraperitoneal nodal location of the mass. This impression is confirmed by identification of the cystic left ovary (Ov) just anterior to the uterine fundus. The patient was known to have cervical cancer, which is partly visualized as an area of low attenuation in b. The cystic consistency of the nodal mass is not unusual for metastatic cervical carcinoma (23).