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Background  There have been two reports on preserving the proximal gastric tube by using intraoperative indocyanine green (ICG)-based photodynamic detection to evaluate blood flow through the anastomosis for gastric tube cancer after esophagectomy. However, in those cases, the period since the first operation was > 3 years 11 months, and there have been no reports of cases with < 1-year periods after the first operation.    Case presentation  A 59-year-old man underwent video-assisted thoracic subtotal esophagectomy and gastric tube reconstruction after two courses of preoperative chemotherapy for middle thoracic esophageal cancer. After half a year, follow-up upper gastrointestinal endoscopy showed a submucosal tumor in the posterior wall of the pre-pyloric region. We performed a biopsy, and the results led to a diagnosis of gastric cancer (moderately differentiated adenocarcinoma: tub2). Clinically, the patient was described as having stage IB (cT2N0M0) gastric cancer of the reconstructed gastric tube. To avoid total gastrectomy, we tried to evaluate the blood flow of the proximal part of the gastric tube by intraoperative ICG-based photodynamic detection. Intraoperative findings confirmed neo-vascularization from the remnant cervical esophagus to the upper region of the gastric tube approximately 7 cm through the esophagogastric anastomosis. Therefore, we dissected the distal part of the gastric tube approximately 4 cm from the esophagogastric anastomosis and then performed Roux-en-Y gastro-jejunostomy via the ante-sternum route. The postoperative course was stable, and the patient was discharged on the 14th postoperative day.    Conclusions  ICG-based photodynamic diagnosis was found to be simple and less invasive. Therefore, even if the postoperative period is short, this method should be considered for evaluation of blood flow prior to performing less invasive surgery.

Successful preservation of the proximal stomach tube by evaluating blood flow using indocyanine green for gastric tube cancer: a case report