Huge complex cystic mass abdomen, what could it be?

This female patient has a huge complex mass, primarily cystic in nature. 

It appears primarily cystic but with poor vascularity. 

Origin of this mass extending from liver to pelvis is likely ovarian. However, hydatid disease also can't be excluded. 

Diagnosis: mucinous cystadenoma or cystadenocarcinoma

2nd possibility: hydatid cysts 

CT scan confirmation needed.

( images courtesy: Dr Golam)

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Sonography of ovarian mass