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A51-year-oldmanhadbeenawareofarightinguinalherniaforseveralyears,butheletituntreated becauseitwaseasilyreduced.Hefellintoawaterwayandbruisedthebaseoftherightfoot.Abdominal painwasintensified,sohevisitedanearbymedicalinstitution.Contrast-enhancedcomputedtomography revealedintraperitonealfreeair.Hewasbroughtintoourhospitalbyambulanceandemergencysurgery wasperformedonthesameday.Atsurgery,weconfirmedthattheabdominalcavityhadbeencontaminatedwithstooljuice,thegreateromentumincarceratedintherightinguinalhernia,andaperforationof about1cminsizewasfoundinthetransversecolon.Theinneringuinalringwascrimpedfromtheabdominalcavityandtheoperationwascompleted.Fivemonthsaftertheoperation,arightinguinalhernia repair using an artificial mesh was performed with an anterior approach. As traumatic rupture of the transversecolonwithintheinguinalherniaisveryrare,thiscaseispresentedtogetherwithareviewof theliterature.

A 60‐year‐old woman with an abnormality discovered during a chest X‐ray was referred to the authors' hospital for diagnosis and treatment. Upon enhanced computed tomography (CT), endoscopic ultrasonography, and magnetic resonance imaging, a tumor on the left side of the lower thoracic esophagus was detected. We diagnosed mediastinum cyst. One year after the first visit, a CT examination confirmed an increase in lesion size. Therefore, surgery was performed using a left thoracoscopic approach in the prone position. Before surgery, 3D models were used for simulation. Excision was performed without leakage of the contents. The histopathological diagnosis was a bronchogenic cyst. The left thoracoscopic surgery in the prone position is an uncommon approach but is useful for resecting tumors in the left side of the lower mediastinum. The authors were well‐prepared and able to perform safe and reliable surgery.

Background Invasion is more likely to occur in gastric cancer affecting larger areas. Poorly differentiated adenocarcinoma tends to invade deep. The cardiac region prefers submucosal invasion because the submucosa is coarser than the other regions. Case presentation A 75-year-old man presented with a chief complaint of abdominal discomfort and weight loss. Esophagogastroduodenoscopy revealed an irregular ulcerative lesion with partial redness of the upper body and lesser curve of the stomach. A continuous shallow depressed lesion invaded the abdominal esophagus by approximately 40 mm. Poorly differentiated adenocarcinomas (por, sig) were observed on biopsy. Grossly, the cancer appeared to extend into the muscle layer; however, we could not confirm invasion into the muscle layer in our biopsy tissue. We diagnosed the lesion as a superficial spreading type of advanced gastric cancer and performed a total gastrectomy, D2-lymph node dissection (spleen preservation), Roux-en-Y reconstruction, and cholecystectomy. Postoperative histopathological examination revealed extensive infiltration of poorly differentiated adenocarcinoma (90 mm × 55 mm), and all were intramucosal lesions. The final pathological diagnosis was T1a, N0, M0, and Stage IA. The postoperative course was uneventful and the patient was discharged on postoperative day (POD) 11. Five years have passed since the operation, and the patient is alive without recurrence. Conclusion We encountered a case of gastric carcinoma in which poorly differentiated adenocarcinomas expanded extensively. All lesions were intramucosal.

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