[Biopsy in rectal cancer recurrences].

The design of a modified needle for trephine biopsy in rectal cancer recurrence in the perineal region is described. The needle design is simple and can be readily manufactured in a mechanic shop. The biopsy material obtained is large enough to type the tumor histologically. The technic of biopsy is not complicated and requires no special skill. Trephine-biopsy for rectal cancer recurrences may substitute completely knife biopsy, being a safe maneuvre in the complex diagnosis of rectal cancer recurrence.