Leg biopsy is usually normally preserved for 15~30 years and needs to be analyzed on a case-by-case basis. Leg biopsy is to obtain leg tissues for pathological examination through local excision and other means, to clarify the nature of lesions, to provide clues and basis for clinical diagnosis, and to help determine the prognosis. Leg biopsy tissue sent to the Department of Pathology, routinely wax block embedded, wax block can be sliced, the cut paraffin thin slice is generally fixed on the slide, after baking fixed, it will not be easy to fall off, so it is also called conventional tissue staining section, white slice, etc., generally preserved by the Department of Pathology of the Hospital Pathology slides, placed in a special section cabinet. Leg biopsy is leg biopsy, for outpatient biopsy specimens are generally kept for about 15 years, inpatient biopsy specimens are generally kept for about 30 years. The purpose of preservation is for later review and control.