<s>[INST] I am a 59 year old female. I started having sudden pain all across my abdomen last Wednesday the pain was worse on my right side that felt like spams, went to my Dr . on Friday he ordered blood work and a abdominal ultrasound on Monday. The results from ultrasound showed I have fatty liver infiltration and a Anechoic posterior cyst measuring 3.8x2.9x5 cm all other organs and ducts showed normal. My Doctor is having me follow up with a CT scan to confirm findings. My question is this........is this considered a very large cyst and also there is no involvement with the ducts why am I having the pain and what will be the most likely treatment? Thank you so much for your information and time.   Marian B [/INST] Hi Mariam,Thanks for writing in.I am particularly unable to comprehend the anechoic posterior cyst mentioned by you. By anechoic, it is taken as a fluid filled cyst. By measurements, 3.8x2.9x5 cm is not a big cyst but not small enough and may be the cause of your pain.A CT scan would be of much more help to characterise the cyst and offer you accurate treatment options.The fatty liver is not a serious finding and needs to be correlated with liver function tests.Take care. </s>