Sarcomatoid Carcinoma in a Resected Hepatic Metastasis of Esophageal Squamous Cell Carcinoma after Chemotherapy

Kotaro Kimura et al.

INTRODUCTION: Sarcomatoid carcinoma is a rare histological variant of carcinoma characterized by a mesenchymal-like morphology, often arising through the epithelial-mesenchymal transition. Although sarcomatoid carcinoma is occasionally observed in primary esophageal carcinosarcoma, its diagnosis at metastatic sites is rare.

A Case of T1bN0 Esophageal Squamous Cell Carcinoma That Developed Recurrence 7 Years after Curative Esophagectomy

Shinichiro Shiomi, et al.

INTRODUCTION: The optimal follow-up period and appropriate examinations for patients with esophageal squamous cell carcinoma (ESCC) who have remained disease-free for 5 years remain controversial.

Four Surgical Cases of Medullary Carcinoma of the Colon

Ayano Inao, et al.

INTRODUCTION: Medullary carcinoma of the colon was formerly classified as poorly differentiated adenocarcinoma. The prognosis is relatively good, with a high degree of microsatellite instability and a predilection for the right colon.

Successful Management of Esophageal Sarcomatoid Carcinoma with Neoadjuvant Chemotherapy and Esophagectomy

Keiichiro Yokota, et al.

INTRODUCTION: Esophageal sarcomatoid carcinoma (ESC) is a rare malignancy characterized by both carcinomatous and sarcomatous components, with no established perioperative chemotherapy standards.

Advanced Thymoma Successfully Treated with Cisplatin, Doxorubicin, and Methylprednisolone Therapy as Induction Chemotherapy: Two Surgical Cases and a Review of the Literature

Ayuna Sato, et al.

INTRODUCTION: Multimodal treatment is required for advanced thymic epithelial tumors. However, to date, no pharmacotherapy has been established. Herein, we present 2 cases in which preoperative cisplatin, doxorubicin, and methylprednisolone (CAMP) therapies were effective.

Two Cases of Mediastinal Non-Seminomatous Germ Cell Tumor with Complete Resection by Robot-Assisted Thoracoscopic Surgery after Induction Chemotherapy: Techniques for Identification and Preservation of the Phrenic Nerve

Ryuji Nakamura, et al.

INTRODUCTION: Mediastinal non-seminomatous germ cell tumors (NSGCTs) are rare tumors. Neoadjuvant chemotherapy followed by complete surgical resection of residual masses is recommended, and is often performed through a median sternotomy or thoracotomy with regard to the influence of induction chemotherapy and tumor size. We herein report 2 cases of mediastinal NSGCT that were surgically resected by robot-assisted thoracoscopic surgery (RATS) using the subxiphoid approach.

Pancreatic Pseudocyst Filled with Biliary Stones Mimicking a Pancreatic Groove Tumor: A Case Report

Hiromitsu Imataki et al.

INTRODUCTION: Reports of fistulas in the common bile duct caused by pancreatic pseudocysts have increased. However, to the best of our knowledge, no prior report has described pseudocysts filled with microbiliary stones that were difficult to differentiate from neoplastic lesions.

A Case of Iatrogenic Right-to-Left Shunting after Atrial Septal Defect Closure

Naohiko Oki, et al.

INTRODUCTION: The main causes of right-to-left shunting (RLS) in patients with atrial septal defect (ASD) are pulmonary hypertension, right ventricular outflow tract obstruction, severe tricuspid regurgitation, and a large ASD resulting in equal bi-atrial pressures. Reports of a case of an unintentional connection of the inferior vena cava (IVC) to the left atrium (LA) discovered many years after the repair of ASD are rare.

Liver Transplantation for Metabolic Dysfunction-Associated Steatotic Liver Disease after Pancreaticoduodenectomy

Takeshi Kano, et al.

INTRODUCTION: Steatotic liver disease (SLD) may develop in some patients after pancreaticoduodenectomy (PD), but no cases requiring liver transplantation (LT) have been reported to date. Here, we present two cases in which LT was performed for decompensated liver cirrhosis (LC) after PD.

Pleuroperitoneal Communication following Right Hepatectomy: Successful Treatment with a Combined Thoracoscopic and Laparoscopic Approach

Sota Nakamura et al.

INTRODUCTION: Pleuroperitoneal communication (PPC) is an abnormal connection between the thoracic and abdominal cavities, allowing ascitic fluid to migrate into the pleural space and cause pleural effusion. Although PPC is a recognized complication in peritoneal dialysis patients, it is rarely reported as a postoperative complication.

Pancreatic Hemangioblastoma in a Patient with von Hippel-Lindau Disease: A Case Report

Naoto Nakamura, et al.

INTRODUCTION: von Hippel-Lindau (VHL) disease is an autosomal dominant hereditary disorder characterized by the development of tumor-like lesions in multiple organs. While central nervous system hemangioblastomas, pancreatic neuroendocrine tumors, and pancreatic cysts are commonly associated with VHL disease, there have been few reported cases of pancreatic hemangioblastoma in patients with VHL disease.

Solitary Fibrous Tumor of the Stomach: Diagnostic Pitfalls and Clinical Implications

Tadakazu Ao et al.

INTRODUCTION: Solitary fibrous tumor (SFT) is a rare mesenchymal neoplasm that most commonly originates in the pleura but can also occur at extrapleural sites, including the abdominal cavity. Among these, primary SFT of the stomach is exceptionally rare. Due to overlapping clinical, endoscopic, and radiologic characteristics, distinguishing SFT from gastrointestinal stromal tumor (GIST) can be particularly challenging. Misdiagnosis may result in inappropriate treatment, such as unnecessary administration of imatinib. Therefore, accurate preoperative differentiation is essential for appropriate management.