Improving the outcomes of patients with Hirschsprung Disease through greater understanding of the histopathology

Hirschsprung Disease (HD) is a congenital disorder marked by absent neural innervation in the distal intestine, leading to obstructive symptoms. Diagnosis involves rectal suction biopsy (RSB), followed by surgery at about three months of age. Transition zone pull-through (TZPT) arises from incomplete surgery, possibly causing complications.

Chapter 1 introduces HD's etiology, pathology, diagnosis, and treatment.

Chapter 2 compares healthy and HD bowels, identifying HD's histopathophysiology. The results highlight the need for circumferential bowel examination to detect TZPT. Predicting diseased bowel length based on patient traits proves challenging.

Chapter 3 explores RSB complications and HD risk factors. RSB is generally safe (0.8% minor complications). Predictors of HD include male gender, syndromes, delayed meconium passage, abdominal distension, bilious vomiting, and failure to thrive.

Chapter 4 evaluates calretinin vs. acetylcholinesterase staining for RSB, favoring calretinin.

Chapter 5 delves into complications during the wait for surgery, affecting 17% of patients. Risk exists for patients with total aganglionic colon (TCA), suggesting the need to limit waiting time.

Chapter 6 assesses resection level determination. Current methods (contrast enema, intraoperative judgment, and full-thickness biopsy) suffice for patients with short segment disease. For patients with longer segment disease, intraoperative pathological examination is advised.

Chapter 7 examines surgical complications, affecting 21% of patients. Postoperative rectal irrigation is a potential cause of anastomotic leakage, warranting transanastomotic drainage tube use.

Chapter 8 studies long-term outcomes after successful primary surgery vs. TZPT with redo surgery or conservative treatment, showing comparable results. Thus, standard surgical treatment isn't required in TZPT cases.