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.
The pelvis is separated into two regions. Youâve got the upper region, the superior part of the pelvic bone, which is called the false pelvis. Itâs also called the greater pelvis. And youâve got the lower part, the inferior part of the pelvis, which is called the true pelvis or the lesser pelvis. The upper part of the pelvis is called the âfalse pelvisâ because itâsâ often regarded as part of the abdominal cavity rather than the pelvic cavity.