Histopathological examination mainly refers to the standardized histopathological section made from the diseased tissue obtained by surgery, endoscopic forceps, or fine needle puncture through a series of tissue treatments such as material extraction, fixation, dehydration, transparency, and waxing, embedding, sectioning, staining, etc., which is observed under the microscope and given a clear pathological diagnosis according to the changes in its tissue structure and morphology, So as to guide clinicians to make targeted treatment according to the results of pathological examination. Histopathological examination is widely used in clinical practice and can be qualitative. It is a gold diagnostic and gold standard, especially for the examination of tumors, which can judge the prognosis and guide clinical treatment.