This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Miscellaneous, Subject name: Pediatrics
A child with Tubercular meningitis (TBM) presents with hydrocephalus after VP shunt has polyuria and hyponatremia. The most probable diagnosis is: 
Select and explain. 
A. Central Diabetes insipidus, B. SIADH, C. Cerebral salt wasting, D. Shunt block
C: Cerebral salt wasting
Answer: C: Cerebral salt wasting 
Explanation: Ans. C. Cerebral salt wastingDifferentiating features of Central Diabetes insipidus, SIADH and Cerebral salt wastingClinical ParameterSIADHCerebral Salt wastingCentral diabetes insipidusSerum sodiumLowLowHighUrine outputNormal or lowHighHighUrine sodiumHighVery highLowIntravascular volume statusNormal or highLowLowIn Shunt block there will be signs of raised ICT like altered sensorium and vomiting.