This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Radiology
Thimble bladder is seen in 
Select and explain. 
A. Cystitis, B. Chronic tubercular cystitis, C. Neurogenic bladder, D. Acute tubercular cystitis
D: Acute tubercular cystitis
Answer: D: Acute tubercular cystitis 
Explanation: Tuberculous urinary infection is secondary to renal tuberculosis.Early tuberculosis of the bladder stas around the ureteric orifice or trigone, the earliest evidence being pallor of the mucosa due to submucous oedema. Subsequently, tubercles may be seen and, in longstanding cases, there is marked fibrosis and the capacity of the bladder is greatly reducedA contracted bladder ('thimble' bladder) with ureteric orifices that are in-drawn ('golf-hole' ureter) may be seen; these changes are due to fibrosis.Bailey and love 27e pg 1442