Weather History for KMSP - October, 2015. This icon will show if stations have a snow accumulation reading. Not all stations report snow accumulation. This icon shows rain accumulation or the liquid equivalent in the case of snow, hail or sleet. It does not differentiate between different forms of precipitation such as rain, snow, hail or sleet.
Retroperitoneal masses: Introduction. Retroperitoneal masses: Retroperitoneal masses is a condition in which there are growths or tumors that develop behind the peritoneum, a membrane that covers most of the abdominal organs.
1 Primarily retroperitoneal organs develop and remain outside of the parietal peritoneum.  Secondarily retroperitoneal organs were initially intraperitoneal, suspended by mesentery. Through the course of embryogenesis they became retroperitoneal, with their mesentery fusing with the posterior abdominal wall. Thus, peritoneum only covers the anterior surface. Examples of secondarily retroperitoneal organs include is the ascending and descending colon.