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.
pelvic arch, pelvic girdle, hip. coccyx, tail bone - the end of the vertebral column in humans and tailless apes. hipbone, innominate bone - large flaring bone forming one half of the pelvis; made up of the ilium and ischium and pubis. ilium - the upper and widest of the three bones making up the hipbone.