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 bony pelvis consists of the two hip bones (also known as innominate or pelvic bones), sacrum and coccyx. 1  Sacrococcygeal symphysis â Between the sacrum and the coccyx. 2  Pubic symphysis â Between the pubis bodies of the two hip bones.  Fig 1.0 â The parts of the pelvic girdle.