1. It is easier to enter retroperitoneum by the straight and closing method.

2. The uterus and retroperitoneum appear to be the most frequent sites of origin for these lesions.

3. MFH of the retroperitoneum, head and neck were large, invasive tumors with destruction of adjacent structures.

4. Hemangiopericytoma is a solid and solitary tumor that may occur anywhere in the body. It is very rare and is often found in the retroperitoneum or lower extremities.

5. The most frequent sites of occurrence are the chest wall, lower extremities, and paravertebral regions, and less frequently within the retroperitoneum, as in this case.

6. One case with maliganant epithelioid angiomyolipoma of kidney associated with tuberous sclerosis developed metastases to liver and retroperitoneum and finally died of the disease.

7. We report a rare case of spontaneous rupture of the biliary tree with biloma in the retroperitoneum .

8. These neoplasms can reach a large size in the retroperitoneum before detection.

9. This chapter reviews in detail the anatomy of the upper urinary tract and adrenal gland as well as the anatomy of the retroperitoneum and abdominal wall, which contain them.

10. The tumor is predominantly located subcutaneously or in the deep soft tissue of the extremities and trunk, peritoneum, or retroperitoneum.

11. Objective:To explore the CT features of hydatidosis of the abdominal cavity and retroperitoneum.

12. This is an uncommon fluid accumulation that can be due to blockage of lymphatic drainage, in this case by a malignant lymphoma involving the mesentery and retroperitoneum.

13. Extrarenal angiomyolipoma is an uncommon disease entity and is rare in the retroperitoneum.

14. Methods:Laparoscopic renal cyst decorbicatiou was performed in 9 cases through retroperitoneum.

15. Methods: Twenty lumbar segments were dissected and studied. The relationship between the retroperitoneum, psoas muscle(Sentencedict), and the lumbar plexus was analyzed.

16. A normal right adrenal gland is shown here positioned between the liver and the kidney in the retroperitoneum .

17. Soft tissue sarcomas can occur in any site throughout the body and are more frequently found in the limbs, peritoneal cavity and retroperitoneum.

18. The most frequent sites of the enlarged lymph nodes were hepatic hilum (12.96%), portacaval space(14.81%), and retroperitoneum (11.73%), respectively.

19. I also have some metastases in my peritoneum and retroperitoneum cavities (basically, inside my abdomen).

20. Malignant fibrous histiocytoma (MFH) is the most common soft tissue sarcoma of adulthood with a male preponderance , and it often involves the extremities and retroperitoneum.