Posts Tagged ‘Ileocolitis’

Pathophysiology of Crohns Disease

05.28.10

Crohns disease begins with crypt inflammation and abscesses, which progress to tiny focal aphthoid ulcers. These mucosal lesions may develop into deep longitudinal and transverse ulcers with intervening mucosal edema, creating a characteristic cobblestoned appearance to the bowel.

Transmural spread of inflammation leads to lymphedema and thickening of the bowel wall and mesentery. Mesenteric fat typically extends onto the serosal surface of the bowel. Mesenteric lymph nodes often enlarge.

Extensive inflammation may result in hypertrophy of the muscularis mucosae, fibrosis, and stricture formation, which can lead to bowel obstruction. Abscesses are common, and fistulas often penetrate into adjoining structures, including other loops of bowel, the bladder, or psoas muscle.

Fistulas may even extend to the skin of the anterior abdomen or flanks. Independently of intra-abdominal disease activity, perianal fistulas and abscesses occur in 25 to 33% of cases; these complications are frequently the most troublesome aspects of Crohns disease.

Noncaseating granulomas can occur in lymph nodes, peritoneum, the liver, and all layers of the bowel wall. Although pathognomonic when present, granulomas are not detected in about half of patients with Crohns disease.

The presence of granulomas does not seem to be related to the clinical course.Segments of diseased bowel are sharply demarcated from adjacent normal bowel (“skip areas”); hence, the name regional enteritis. About 35% of Crohns disease cases involve the ileum alone (ileitis); about 45% involve the ileum and colon (ileocolitis), with a predilection for the right side of the colon; and about 20% involve the colon alone (granulomatous colitis), most of which, unlike ulcerative colitis (UC), spare the rectum.

Occasionally, the entire small bowel is involved (jejunoileitis). The stomach, duodenum, or esophagus is clinically involved only rarely, although microscopic evidence of disease is often detectable in the gastric antrum, especially in younger patients. In the absence of surgical intervention, the disease almost never extends into areas of small bowel that are not involved at first diagnosis.

There is an increased risk of cancer in affected small-bowel segments. Patients with colonic involvement have a long-term risk of colorectal cancer equal to that of UC, given the same extent and duration of disease.

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Crohns Disease in Children

10.31.09

In the last quarter century, it has become clear that Crohns disease and ulcerative colitis affect large numbers of children and young teens. Nutritional deficiency is a major issue in treatment of children with Crohns disease. Children are growing machines.

Inflammatory bowel disease may not cause great weight loss for youngsters at first, so failure to grow normally or backsliding on height and weight charts should be taken as signs that something is wrong and worth investigating. Children facing Crohns disease also have significant self-image issues to deal with.

The disease changes their routines, and its effects may separate them from the normal activities of childhood and adolescence. Therefore, these youngsters need sensitive support from family, friends, and physicians to help them maintain their social, as well as their physical, growth. Crohns disease is a serious, chronic disease affecting the digestive system. Chronic means that the disease is long-term and persistent, usually lifelong. Crohns disease causes inflammation, most often in the small intestine (which has three parts: duodenum, jejunum, and ileum).

The walls and lining of the affected areas become red and inflamed, leading to ulcers and bleeding. Crohns disease sometimes is named by referring to inflammation in the part of the intestine affected, such as jejunoileitis, ileitis, ileocolitis, or colitis (when it involves the large intestine, also called the colon).

Crohns disease can appear at any age, but it is most often diagnosed in adults in their 20s and 30s. However, approximately 30% of people with Crohns disease develop symptoms before 20 years of age. In the United States, about 100,000 teens and preteens have Crohns disease.Along with ulcerative colitis, a similar illness, Crohns disease is also called inflammatory bowel disease, or IBD.

Ulcerative colitis attacks only the large intestine in a continuous manner and does not affect the entire thickness of the bowel wall. Crohns disease, on the other hand, can occur anywhere in the digestive tract, from mouth to the anus, attacks different sites in the intestine with areas of normal intestine in between (“skip lesions”), and affects the full thickness of the intestinal wall.

Both conditions wax and wane: there are times when symptoms reappear or get worse (exacerbations or “flares”) and other periods when symptoms get better or go away altogether (“remission”).While Crohns disease causes many problems for people of all ages, it can present special challenges for children and teens. In addition to bothersome and often painful symptoms, the disease can stunt growth, delay puberty, and weaken the bones. Crohns disease symptoms may sometimes prevent a child from participating in enjoyable activities.

The emotional and psychological issues of living with chronic disease can be especially difficult for young people. As many as 70% of children with the disease have inflammation of the lower part of the ileum. More than half of these children also have inflammation in variable segments of the colon.

•    About 10%-20% of children have inflammation in the colon only.
•    Another 10%-15% have inflammation scattered around the small bowel, mainly in the middle section (jejunum and upper ileum).
•    A very small number have inflammation only in the stomach and the uppermost section of the small intestine where the stomach empties into the bowel (duodenum).

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