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.
Human Anatomy Â» Digestive System Â» Retroperitoneal Space. Retroperitoneal space is the anatomical space in the abdominal cavity behind the parietal peritoneum. It extends from the 12 th thoracic vertebra and 12 th rib above to the sacrum and iliac crest below.The floor of the space, that is the posterior wall of the abdomen in this region, is formed by; 1  Psoas muscle.2  Quadratus lumborum muscle. 3  Origin of transverses abdominis muscle.he floor of the space, that is the posterior wall of the abdomen in this region, is formed by; 1  Psoas muscle. 2  Quadratus lumborum muscle. 3  Origin of transverses abdominis muscle.