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 hip joint is a ball and socket joint located where the thigh bone (femur) meets the pelvic bone. The upper segment (head) of the femur is a round ball that fits inside the cavity in the pelvic bone that forms the socket, also known as the acetabulum.The ends of the bone are covered with a smooth, cushioning layer called articular cartilage.he articular cartilage is what allows the bones to glide smoothly. While the cartilage covers the entire head of the femur, the acetabulum cartilage is in the shape of a horseshoe with a depression (fossa) in the center of the socket.