<prompt> One of the following diseases shows urinary bladder calcification radiologically which resembles fetal head in the pelvis.TuberculosisSchistosomiasisChronic cystitisMalignancy  <response>: Ans. is b ie. Schistosomiasis Ref. Chapman, 3e, 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. 