Very Early Onset of Fistulizing Inflammatory Bowel Disease With RIPK1 Mutation: A Case Report

Area of Science:

• Pediatric Gastroenterology
• Genetics
• Immunology

Background:

• Infantile inflammatory bowel disease (IBD) is rare, affecting children under two, often linked to genetic factors and monogenic defects.
• This subgroup exhibits treatment resistance and frequent complications, necessitating surgical interventions.
• Early-onset IBD often presents unique challenges compared to IBD in older populations.

Observation:

• A 16-month-old male with consanguineous parents presented with severe perianal disease, diarrhea, fever, and failure to thrive.
• The patient was diagnosed with Crohn's disease confirmed by endoscopy and biopsy.
• Initial management included ileostomy and surgical repair, followed by adalimumab treatment.

Findings:

• Genetic analysis revealed mutations in receptor-interacting protein kinase 1 (RIPK1).
• Despite adalimumab therapy, the patient developed a colovesical fistula and dysuria.
• A secondary surgical repair was required due to treatment complications.

Implications:

• This case underscores the critical role of genetic factors, specifically RIPK1 mutations, in severe infantile IBD.
• It highlights the limitations of conventional treatments in genetically susceptible pediatric IBD patients.
• Further research into targeted therapies for RIPK1-associated IBD is warranted for improved outcomes.