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.
Hips, Shoulders, Arms, and Legs: Bones of the Appendicular Skeleton The bones of the human skeleton are divided into two groups. The axial skeleton includes all the bones (that form bony structures) along the bodyâs long axis.he Bones of the Pelvis. The pelvic girdle is a ring of bones attached to the vertebral column that connects the bones of the lower limbs to the axial skeleton. The pelvic girdle consists of the right and left hip bones.