Gastric Diverticulum As An Incidental Finding In A Whole-Body CT Scan Post-Breast Cancer Treatment: A Case Report

Limited access to advanced imaging in many parts of Nigeria has contributed to missed or delayed diagnosis of some rare conditions. This case report highlights an incidental finding of a gastric diverticulum during post-treatment surveillance in a breast cancer patient and thus underscores the diagnostic value of imaging in resource-limited settings. A 51-year-old woman undergoing post- treatment surveillance for left breast cancer had a contrast-enhanced whole body CT scan, which showed no metastatic disease but revealed a 2.5 cm air- and fluid-filled outpouching arising from the posterior gastric fundus, consistent with a gastric diverticulum. The patient remained asymptomatic. Conservative management was recommended, including dietary modifications, optimization of glycemic control, and follow-up with endoscopy if symptoms developed. Gastric diverticula are rare, and can be seen incidentally on CT where they may mimic renal or adrenal pathologies. This case presents a possible diagnostic pitfall, one that emphasizes the value of imaging in detecting incidental findings with potential clinical relevance.