Reduced port duet TLDG for early gastric cancer is feasible in terms of patient safety and quality of lymph node dissection.

Single-port TLDG might be considered as a treatment option for a limited subset, such as females or less obese patients with early gastric cancer.

Gastric duplication cyst is a rare congenital anomaly of the gastrointestinal tract and is especially uncommon in adults. Most cases in adults are discovered incidentally on radiological examination or gastric endoscopy. Accurate diagnosis of these cysts before resection is difficult. Differential diagnoses are varied. Malignant transformation of a gastric duplication cyst is very rare. We present three cases of asymptomatic noncommunicating gastric duplication cysts in adults.