Thank you for your query.
Based on your description, your sister seems to have had a brain tumor
(excess water accumulation in the brain).
Tumor has been removed by an operation, and the excess fluid frmo brain is diverted out by VP shunt.
The coma can be due to damage of vital structures in the brain, fits
, or electrolyte imbalance
(such as very low sodium).
The exact cause can be found out by the treating doctor and appropriate treatment given for the same.
Dr Sudhir Kumar MD DM (Neurology)
Senior Consultant Neurologist
Apollo Hospitals, Hyderabad