This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Miscellaneous (Bladder), Subject name: Surgery
One of the following diseases shows urinary bladder calcification radiologically which resembles fetal head in the pelvis. 
Select and explain. 
A. Tuberculosis, B. Schistosomiasis, C. Chronic cystitis, D. Malignancy
B: Schistosomiasis
Answer: B: Schistosomiasis 
Explanation: Ans. is 'b' ie. Schistosomiasis (Ref. Chapman, 3/e, p 332) " Schistosomiasis - is the commonest cause of calcification in the wall of the bladder. Thin curvilinear calcification outlines a bladder of normal size and shape. Calcification spreads proximally to involve the distal ureters (appearing as two parallel lines) in 15%." This paragraph points towards schistosomiasis. - Schistosomiasis causes calcification in the wall of the bladder which outlines the bladder. A full bladder will appear as a fetal head in the pelvis , on an X-ray.