High density shadow in the left pelvis of women is not necessarily cancer, but may also be due to inflammation calcification or benign mass. 1. Cancer: high density shadow in the left pelvis during imaging examination may be caused by ovarian cancer or pelvic cancer, and the patient may have symptoms such as irregular vaginal bleeding. 2. Calcification of inflammation: some women have pelvic inflammation, under repeated stimulation of inflammation, local calcification of pelvic cavity will occur, which can also be manifested as high density shadow, and patients will have symptoms such as lower abdominal pain, vaginal bleeding or abnormal vaginal secretion. 3. Benign lumps: the left-sided pelvic hyperdense shadow of women may also be caused by ovarian cysts or pelvic cysts, which will cause patients to experience dysmenorrhea, abdominal pain, fever and other symptoms. When the result of left-sided pelvic hyperdense shadow appears, detailed examination should be carried out to confirm the diagnosis of the disease and timely treatment.