What is the diagnosis?

5 year old with massive hepatomegaly

CT Abdomen shows increased vascularity and calcification in the liver.

What happened to this patient?

This is an infant who was post-op and started getting drowsy while on intravenous and oral fluids.
What is the explanation?

Legend: Na-sodium; S.Osm- serum osmolality; U.Osm-urine osmolality;
I/O- input/output fluids; ins- fluid intake (oral and intravenous)

CT Head without contrast