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 word pelvis is generally used to refer to that part of the body just below the abdomen, which is the area where the trunk joins the legs. More specifically, the term refers to the part of the skeleton, also known as the bony pelvis or pelvic girdle, which encloses and supports that area of the body. The word means basin in Latin, which is what the shape of the bony structure resembles.