What Do This Test Result From Transvaginal Study Indicate?

I m reading the results from my recent transvaginal study with bladder emptying. A transabdominal evaluation was also performed. For the Uterus: A small amount of anechoic fluid is seen in the endocervical canal . I am 59 years old, 15 years postmenopausal. The test was performed due to my complaint of pain in the lower right quadrant of my abdomen. What causes anechoic fluid in the endocervical canal?