42 Cystic Retroperitoneal Mass

CLINICAL IMAGAGINGAN ATLAS OF DIFFERENTIAL DAIGNOSIS

EISENBERG

DR. Muhammad Bin Zulfiqar PGR-FCPS III SIMS/SHL

• Fig GU 42-1 Pancreatic pseudocyst. Thin-walled fluid collection in the anterior pararenal space (arrow).56

• Fig GU 42-2 Lymphocele. Hypoattenuating cystic mass located in the obturator space (arrows) and compressing the urinary bladder (B) in this woman who three months previously had undergone a radical hysterectomy for cervical cancer.56

• Fig GU 42-3 Urinoma. Large fluid collection with ring enhancement in the presarcal space (arrow) in a woman who had undergone radical hysterectomy for cervical cancer.56

• Fig GU 42-4 Hematoma. Huge cystic mass with thin walls in the right retroperitoneal space (arrow).56

• Fig GU 42-5 Cystic lymphangioma. Lobulated cystic mass in the anterior pararenal space. The third portion of the duodenum is compressed by the mass.56

• Fig GU 42-6 Lymphangioleiomyoma. Large cystic retroperitoneal masses fill the lower abdomen. Note the fat-fluid level (arrow).57

• Fig GU 42-7 Mucinous cystadenoma. Large mass of homogeneously low attenuation in the right anterior pararenal space (arrow).56

• Fig GU 42-8 Cystic teratoma. Well-defined hypoattenuating mass with internal septa and calcifications in the right anterior pararenal space (arrow).56

• Fig GU 42-9 Mullerian cyst. Well-defined cystic mass in the left retroperitoneal space (arrow).56

• Fig GU 42-10 Epidermoid cyst. Well-defined hypoatttenuating mass in the pelvic retroperitoneum (thick arrow). There is anterior displacement of the rectum (thin arrow).56

• Fig GU 42-11 Tailgut cyst. Well-defined, thin-walled multicystic mass in the presacral space (thin arrows). The rectum is compressed and anteriorly displaced (thick arrow).56

• Fig GU 42-12 Cystic change in solid neoplasm. (A) Paraganglioma appears as a cystic mass with irregular walls in the right anterior pararenal space (arrow). (B) Neurilemoma appears as a cystic mass in the pelvic retroperitoneum (arrow).56

• Fig GU 42-13 Pseudomyxoma retroperitonei (from rupture of a mucinous cystadenocarcinoma of the appendix). Lobulated low-attenuation masses in the right lower quadrant (thick arrows), mass effect on the right psoas muscles and right ureter, and a tiny wall calcification (thin arrow).56

• Fig GU 42-14 Perianal mucinous adenocarcinoma. Thin-walled collection in the anterior pararenal space (arrow).56