Wiki cul de sac biopsy

Cul de sac is Pouch of Douglas; it is nothing but the fold of peritoneum, on the abdominal cavity side -an extension of the peritoneal cavity between the rectum and back wall of the uterus in the female human body.

For biopsy, look for peritoneal biopsy/pelvic peritoneal biopsy. Remember it is not retro peritoneal structure.
 
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