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Retroperitoneal Space

Pneumoretroperitoneum is by definition presence of gas within the retroperitoneal space. It is always abnormal and has a relatively small differential. If localised, and especially in the presence of an air-fluid level, a retroperitoneal absecess should be suspected. Read more: http://radiopaedia.org/articles/pneumoretroperitoneum

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Psoas muscle abscess and fluid collections are located in the retrofascial space rather than in the retroperitoneal space because the psoas muscles are located posterior to the transversalis fascia, which is the posterior boundary of the retroperitoneum. Ultrasonography is diagnostic in only 60% of cases of psoas abscess, compared with 80% to 100% for CT. Read more: http://radiopaedia.org/articles/psoas-muscle-abscess

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The retroperitoneal space (retroperitoneum) is the anatomical space (sometimes a potential space) in the abdominal cavity behind (retro) the peritoneum. Description from imgarcade.com. I searched for this on bing.com/images

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