Multiple malignant lymphoma within an ileal blind loop--report of a case

Area of Science:

• Gastroenterology and Surgical Oncology
• Pathology of the Digestive System

Background:

• A 55-year-old woman with a history of appendicitis surgery and subsequent ileotransversostomy presented with abdominal fullness and leg edema.
• The patient's prior surgery, performed 35 years earlier for adhesive ileus, resulted in a side-to-side ileotransversostomy, creating a potential blind loop.
• Blind loop syndrome is a known complication of intestinal bypass surgeries, characterized by bacterial overgrowth and altered intestinal environments.

Observation:

• Clinical presentation included significant abdominal fullness and bilateral leg edema, suggestive of systemic or gastrointestinal complications.
• Diagnostic workup identified a dilated ileal blind loop, a consequence of the previous ileotransversostomy.
• The resected intestinal segment revealed multiple crater-like lesions within the dilated blind loop.

Findings:

• Histological examination of the lesions confirmed nodular proliferation of atypical lymphocytes.
• Evidence of lymph follicle proliferation was observed in the mucosa of the blind loop.
• The definitive diagnosis was non-Hodgkin lymphoma, specifically the diffuse medium-sized cell type, originating within the ileal blind loop.

Implications:

• This case suggests a potential etiological link between the altered intestinal environment in blind loop syndrome (fecal stasis, bacterial overgrowth, toxins) and the development of non-Hodgkin lymphoma.
• The findings underscore the importance of considering long-term gastrointestinal complications, including malignancy, following extensive intestinal surgery.
• Further research into the pathogenetic mechanisms connecting chronic inflammation and bacterial dysbiosis in blind loops to lymphomagenesis is warranted.