<prompt> Mc cause of BL cornual block seen on HSG:TBEndometriosisPhysiological spasmPID  <response>: Ans. is c, i.e. Physiological spasmOn HSG in TB: BL cornual blockage can be seen but Mc cause of bilateral cornual block on HSG is not genital TB. It is physiological block due to spasm of the cornual end of the tube while doing HSG. 