This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Surgery
Earliest sign in X-ray in TB spine is: March 2011 
Select and explain. 
A. Paraveebral shadow, B. Narrowing of disc space, C. Gibbus, D. Straightening of spinal curves
B: Narrowing of disc space
Answer: B: Narrowing of disc space 
Explanation: Ans. B: Narrowing of disc space Reduction of the disc space is the earliest sign in the commoner, paradiscal type of tuberculosis Skeletal TB: Earliest symptom of spinal TB: Back pain Earliest sign in Pott's disease: Narrowing of disc space MC veebrae to be involved in TB spine: T9-T12 TB spine stas in: Veebral body (paradiscal) Spina ventosa: TB dactylitis