Pleurisy Causes & Risk Factors. Causes and Risk Factors for Pleurisy. Pleurisy can develop as a complication of several conditions. In some cases, the condition is idiopathic (i.e., occurs with no known cause). The most common cause for pleurisy is viral infection (e.g., influenza, pneumonia).
An extrarenal pelvis is a normal variation from the usual anatomy, and it does not indicate a state of disease. However, renal pelvises do not usually protrude in such a manner, and it may appear as if there is a blockage in the renal pelvis that is preventing urine from emptying, which is a serious medical condition.
Â© 2007 Lippincott Williams & Wilkins S59. PELVIS. The classification of pelvic ring and acetabular fractures is. based on the work of Pennal and Tile and Judet and Letournel. This classification was developed to accommodate the alpha-. numeric system of The Comprehensive Long Bone System. DEFINITIONS. Pelvic ringhas two arches: (a) posterior arch is behind ac-.