A Case of Foreign Body Granuloma in the Sigmoid Mesocolon Difficult to Diagnose Preoperatively

Key Points

• To discuss the difficulty in preoperative diagnosis of foreign body granuloma in the sigmoid mesocolon.
• Case report of a 74-year-old female with a history of appendectomy and subsequent imaging findings.
• Abdominal CT and PET/CT were utilized to assess the tumor characteristics and guide surgical intervention.
• Laparoscopic resection of the sigmoid colon was performed with pathology revealing foreign body granuloma.
• Initial suspicion of gastrointestinal stromal tumor (GIST) based on imaging and elevated FDG uptake in the mass.
• Post-surgical pathology confirmed the diagnosis as foreign body granuloma, highlighting diagnostic challenges during preoperative assessments.
• Emphasizes the need for considering foreign body granuloma in differential diagnosis for abdominal masses with FDG accumulation.