DR KEITH WHEELER / SCIENCE PHOTO LIBRARY DR KEITH WHEELER / SCIENCE PHOTO LIBRARY
Acute appendicitis. Light micrograph of a section through an appendix that has been removed due to appendicitis. The inner epithelial lining of the appendix has become ulcerated and is secreting an inflammatory exudate (thick fluid). Blood (red) is seen within the lumen (white). As the disease progresses, the inflammation will increase as it spreads throughout the appendix until exudate is present on all surfaces. If it spreads to the peritoneum (the lining of the abdominal cavity) immediately surrounding the appendix, the condition becomes critical and may be fatal if left untreated. Magnification: x3.5 when printed at 10 centimetres wide.
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