<prompt> Failure of migration of neural crest cells is seen inAlbinismCongenital megacolonOdontomesAdrenal tumor  <response>: Congenital megacolon nirschsprung tiscase due to failure of migration of neural crest to distal part of the tube so absence of para sympathetic myenteric acerbachs ganglia. Diseased segment is construction and the segmanr proximal is dilated due to faxical retention. 