[P112] 胆道　EPLBD 4

[P-565] Papillary large balloon dilatation versus mechanical lithotripsy for the management of difficult CBD stones

^○Mazen Naga¹, ahmed el badri¹, shaimaa elkholy¹, sameh nabil² (1.internal medicine departmenet, faculty of medicine , Cairo University, Egypt, 2.internal medicine department , faculty of medicine Cairo university, 3.Helwan University, Egypt)