ral ▁mass ▁( us ually ▁a ▁m ature ▁ter at oma ▁or ▁anterior ▁men ingo ce le ), ▁an ore ct al ▁mal formation ▁and ▁sac ral ▁d ys gen esis . ▁ ▁Pres entation ▁ ▁Comp lications ▁ ▁Mat ernal ▁comp lications ▁of ▁pre gn ancy ▁may ▁include ▁mirror ▁synd rome . ▁ ▁Mat ernal ▁comp lications ▁of ▁delivery ▁may ▁include ▁a ▁Ces are an ▁section ▁or , ▁altern atively , ▁a ▁v ag inal ▁delivery ▁with ▁mechanical ▁d yst ocia . ▁ ▁Comp lications ▁of ▁the ▁mass ▁effect ▁of ▁a ▁ter at oma ▁in ▁general ▁are ▁addressed ▁on ▁the ▁ter at oma ▁page . ▁ ▁Comp lications ▁of ▁the ▁mass ▁effect ▁of ▁a ▁large ▁S CT ▁may ▁include ▁hip ▁d ys pl asia , ▁bow el ▁obst ruction , ▁ur inary ▁obst ruction , ▁hyd r one ph ros is ▁and ▁hydro ps ▁fet alis . ▁ ▁Even ▁a ▁small ▁S CT ▁can ▁produce ▁comp lications ▁of ▁mass ▁effect , ▁if ▁it ▁is ▁pres ac ral ▁( Alt man ▁Type ▁IV ). ▁ ▁In ▁the ▁fet us , ▁severe ▁hyd r one ph ros is ▁may ▁contribute ▁to ▁in ade qu ate ▁lung ▁development . ▁ ▁Also ▁in ▁the ▁fet us ▁and ▁new born , ▁the ▁an us ▁may ▁be ▁imper for ate . ▁ ▁Later ▁comp lications ▁of ▁the ▁mass ▁effect ▁and / or ▁surg ery ▁may ▁include ▁ne uro gen ic ▁bl ad der , ▁other ▁forms ▁of ▁ur inary ▁in cont in ence , ▁f ec al ▁in