is the wall of uterus
. Generally it is expected to be uniform or homogeneous but in your case it is mentioned as heterogeneous or non uniform. There is also mention of an 8 mm mass in posterior wall of uterus. In simple words there is gland tissue in the uterus wall which is normally devoid of such tissue with the doubtful presence of a small (really small 8 mm) lump beside it.
2. Minimal free fluid in cul de sac - pelvi inflammatory disease: There is some fluid in the space behind your uterus. While this copuld also be normal (upto 5ml), if patient is clinically symptomatic for pelvic infetion and quantity is more, a diagnosis in favour of local infeaction around the uterus is made.