A microscopic colitis, (i.e. only seen under the microscope) caused
by the formation of a collagen band (a tough and inelastic tissue) under
the lining of the bowel. The main feature of the disease is watery diarrhoea.
A microscopic colitis which, under the microscope, demonstrates increased
levels of lymphocytes (white cells) and is characterised by watery diarrhoea,
usually without blood.
Inflammation caused by partial death of tissue (infarct) due to either
a blockage in the blood supply, e.g. after major abdominal surgery or
a reduced supply, e.g. poor cardiac output in heart disease. It occurs
almost entirely in the elderly and is characterised by violent bloody
diarrhoea and abdominal pain. It can mimic Crohn's disease as it is variable
in extent, location and severity.
Inflammation developing from the diversion of the faecal stream following
colostomy or ileostomy. Colitis may develop in the portion of the bowel
which no longer has faeces passing through.
This is a rare disease causing inflammation in the blood vessels and
can affect many organs in the body. When present in the bowel, it can
mimic Crohn's disease as it tends to occur in the ileocaecal area and
segments of the colon.
Certain infections caused by various organisms can result in damage
to the lining or other layers of the intestine which may mimic Crohn's
disease or ulcerative colitis. For example:
• cytomegalovirus (CMV)
• clostridium dificile
It is therefore important to exclude this possibility before making
a diagnosis of chronic inflammatory bowel disease.
Indeterminate colitis (IC) is the name doctors give to inflammation
in the large bowel which could be caused either by either Ulcerative
Colitis (UC) or Crohn's disease.
Histological changes and biopsies do
not allow the pathologists to decide which disease is present. It is
customary to treat IC in a similar way to UC.