your ultrasound report means that while testing your urinary bladder
(sac which stores urine)was not completely full. it is expected to be fully distended to see surrounding structures better.
adnexa are the structures attached to the uterus
which show a fluid filled cyst
in your case. given that there is no fluid outside the cyst and no lymph
node (adenopathy) the cyst is not worrisome.
but needs attention. depending on your age and symptoms your gynaec will decide future course of action.
hope this is helpful