Learn the anatomy of the sacroiliac joint.

Learn more about Raynaud disease, including symptoms, causes, risk factors, and possible triggers.

Rhabdomyolysis is a condition in which a large amount of muscle is damaged. It is a medical emergency and needs treatment in the hospital.

Your lungs are each surrounded by two layers of membrane. The space between the layers is called the pleural space. Excess fluid, blood, pus, or air in the pleural space makes it hard for the lung to expand and makes breathing difficult. A chest tube is a soft, flexible tube put into the pleural space that drains blood, air, or excess fluid.

A lumbar drain is a soft, thin, sterile tube (also called a catheter) that your healthcare provider places though the skin of your back, into your lower (lumbar) spine. The drain collects cerebrospinal fluid (CSF). This is a clear fluid that surrounds your spinal cord and brain to protect them from injury. Read on to learn more about lumbar drain placement and how it’s done.

Ischemic colitis happens when blood flow to the colon is reduced or blocked. It should be treated right away.

A CT colonography is used to view the inside of your lower digestive tract (colon and rectum). It can help screen for colon cancer and for polyps. This test is sometimes called virtual colonoscopy.

People on breathing machines, called ventilators, have an increased risk of developing pneumonia. Ventilator-associated pneumonia (VAP) is caused by germs that enter the lungs when a person is on a breathing machine.

A catheter-associated urinary tract infection (CAUTI) is an infection of the urinary system. CAUTI is caused by germs that get into the urinary tract when a urinary catheter is used. This is a tube that's placed into the bladder to drain urine.

With a tracheostomy, your healthcare provider makes a small hole (stoma) in your windpipe (trachea) through your neck. A tracheostomy tube (trach tube) is then placed into the stoma. Air goes into and out of your lungs through the tube. Here are answers to some common questions that people often ask about tracheostomy.