The goal of this clinical trial is to compare the clinical efficacy and safety of laparoscopic Nissen fundoplication (LNF) versus laparoscopic Hill-Snow repair (LHS) in the management of patients with congenital hiatus hernia, to evaluate the role of upper gastrointestinal endoscopy in the preoperative diagnosis and planning \& to determine the utility of intraoperative endoscopy in guiding the surgical repair and ensuring its technical adequacy. main questions are: * which one of these techniques is safer with higher clinical efficacy represented by relief of GERD symptoms ? * does upper GI endoscopy have a role in preoperative stage regarding diagnosis of condition and planning of treatment ? * does upper GI endoscopy have a role in intraoperative stage regarding guiding the surgical repair and ensuring its adequacy ? all participants will be randomly assigned in one of two groups: * one group undergoing Laparoscopic Nissen Fundoplication * the other group undergoing Laparoscopic Hill-Snow repair each participsant will have preopertive, intraoperative and postoperative upper GI endoscopy to assess objectively clinical efficacy of both techniques and to define the integral role of endoscopy in all three perioperative stages
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Degree of relief of GERD symptoms assessed by GERD Health-Related Quality Of Life (GERD-HRQL) score
Timeframe: 6 months postoperatively