ABSTRACT
Endometriosis is defined as the presence of endometrial tissue, e.g. gland and stroma, outside the uterus. Extrapelvic endometriosis is a rare condition but it occurrs in the gastrointestinal tract, kidney, pancreas, umbilicus, perianal area, abdominal scar tissue, lung or central nervous system except spleen. We have experienced a case of extrapelvic endometriosis in an adolescent girl, who complained of severe left upper quadrant abdominal pain and vomiting. The lesion was diagnosed by abdominal ultrasonography and computerized tomography, and confirmed histologically by exploratory laparotomy and mass excision biopsy. During menstration after surgery, she had no complaint of abdominal pain nor dysmenorrhea. We report this case with a review of associated literature.