Pathological processes leave their imprint on the tissue. Interpreting these changes can give key information about a disease and aid diagnosis. Some of the changes are very subtle, whereas others are easily seen. In all cases it is important to distinguish natural variations from pathological changes, and it requires many years of experience to be able to recognise the different diseases that can occur - even within a single type of tissue. This course should have given you some insight into the subject of histopathology, and the type of work that is done by specialists in this field.