Question: What is (are) Alagille Syndrome ?
Answer: The digestive system is made up of the gastrointestinal (GI) tractalso called the digestive tractand the liver, pancreas, and gallbladder. The GI tract is a series of hollow organs joined in a long, twisting tube from the mouth to the anus. The hollow organs that make up the GI tract are the mouth, esophagus, stomach, small intestine, large intestinewhich includes the colon and rectumand anus. Food enters the mouth and passes to the anus through the hollow organs of the digestive system. The liver, pancreas, and gallbladder are the solid organs of the digestive system. The digestive system helps the body digest food.
Source: NIDDK

Question: What are the treatments for Alagille Syndrome ?
Answer: Treatment for Alagille syndrome includes medications and therapies that increase the flow of bile from the liver, promote growth and development in infants' and children's bodies, correct nutritional deficiencies, and reduce the person's discomfort. Ursodiol (Actigall, Urso) is a medication that increases bile flow. Other treatments address specific symptoms of the disorder. Liver failure. People with Alagille syndrome who develop end-stage liver failure need a liver transplant with a whole liver from a deceased donor or a segment of a liver from a living donor. People with Alagille syndrome who also have heart problems may not be candidates for a transplant because they could be more likely to have complications during and after the procedure. A liver transplant surgical team performs the transplant in a hospital. More information is provided in the NIDDK health topic, Liver Transplantation. Pruritus. Itching may decrease when the flow of bile from the liver is increased. Medications such as cholestyramine (Prevalite), rifampin (Rifadin, Rimactane), naltrexone (Vivitrol), or antihistamines may be prescribed to relieve pruritus. People should hydrate their skin with moisturizers and keep their fingernails trimmed to prevent skin damage from scratching. People with Alagille syndrome should avoid baths and take short showers to prevent the skin from drying out. If severe pruritus does not improve with medication, a procedure called partial external biliary diversion may provide relief from itching. The procedure involves surgery to connect one end of the small intestine to the gallbladder and the other end to an opening in the abdomencalled a stomathrough which bile leaves the body and is collected in a pouch. A surgeon performs partial external biliary diversion in a hospital. The patient will need general anesthesia. Malabsorption and growth problems. Infants with Alagille syndrome are given a special formula that helps the small intestine absorb much-needed fat. Infants, children, and adults can benefit from a high-calorie diet, calcium, and vitamins A, D, E, and K. They may also need additional zinc. If someone with Alagille syndrome does not tolerate oral doses of vitamins, a health care provider may give the person injections for a period of time. A child may receive additional calories through a tiny tube that is passed through the nose into the stomach. If extra calories are needed for a long time, a health care provider may place a tube, called a gastrostomy tube, directly into the stomach through a small opening made in the abdomen. A child's growth may improve with increased nutrition and flow of bile from the liver. Xanthomas. For someone who has Alagille syndrome, these fatty deposits typically worsen over the first few years of life and then improve over time. They may eventually disappear in response to partial external biliary diversion or the medications used to increase bile flow.
Source: NIDDK