. The American journal of roentgenology, radium therapy and nuclear medicine . Fig. 4. of a Normal ix the Position. Intestines and organswith mesenteric attachment have fallen forward, leaving clear praevertebral area. Encroachmentupon this space !)y a mass originating in the retroperitoneal tissues can be clearly Fig. 5. New Growth of Left Kiuxev Seex ix the IvetroiEritoxe.\l Positiox to upon the Pr,\evertebr,\l Cle.\r not encroached upon. The liver shadow is and was represented by a shadow in the seen with its diaphragmatic at


. The American journal of roentgenology, radium therapy and nuclear medicine . Fig. 4. of a Normal ix the Position. Intestines and organswith mesenteric attachment have fallen forward, leaving clear praevertebral area. Encroachmentupon this space !)y a mass originating in the retroperitoneal tissues can be clearly Fig. 5. New Growth of Left Kiuxev Seex ix the IvetroiEritoxe.\l Positiox to upon the Pr,\evertebr,\l Cle.\r not encroached upon. The liver shadow is and was represented by a shadow in the seen with its diaphragmatic attachments. middle of the al^domen. An antero-posterior To illustrate the value of this position let examination revealed the extent of the mass us proceed to the second case. to be even greater than supposed and it 132 Retroperitoneal Masses Detected by Pneumoperitoneum seemed to go down into the pelvis. The liverwas shown to be uninvolved. An examination in the lateral positionshowed the spleen clearly separated from tliemass but the left kidney could not be defin-itely outlined. In an effort to determinewhether the left kidnev was involved in the sition with Figure 5 as a result. The intes-tines, stomach and all organs with mesentericattachment have fallen forward. The liverhas dropped exceptionally far forward andthe only organ which still remains in


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