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.
In brief: Extra renal pelvis. The pelvis of the kidney is middle where everything centers. As urine is made by filtering blood this area collects urine then leads out through ureters to bladder. You have a more extensive area that resides in part outside the parameters of the kidney. Sometimes the appearance of this may be the result of obstruction. In general the concern is a larger pelvis means urine is stagnant. In brief: Extra renal pelvis. The pelvis of the kidney is middle where everything centers.