The goal of this observational study is to conducted a comprehensive analysis of the factors contributing to redo- Pull-through surgery for constipation recurrence in Children who are suffering from Hirschsprun' s disease (HSCR) and its allied disorders (ADHD) . The main question[s] it aims to answer are:

1. Our study focused on the treatment and prognosis of these conditions, drawing upon 16 years of patient data and clinical experiences"
2. What are the key risk factors affecting the prognosis of recurrent constipation patients undergoing repeat PT?

Inclusion Criteria:

1. Patients admitted to the department of pediatric surgery at Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, between January 2005 and December 2021;
2. HSCR and ADHD patients admitted due to "constipation recurrence" and requiring redo-PT.

Exclusion Criteria:

1. Patients undergoing staged surgeries or undergoing internal sphincterotomy;
2. Patients with concomitant severe congenital anomalies such as Down syndrome; (3) Patients with incomplete postoperative follow-up data after redo-PT.

This study collected comprehensive clinical data and compiled postoperative follow-up data from patients who underwent corrective surgery for HSCR and ADHD and subsequently required redo-PT due to recurrent constipation.