Collision Tumor of Gallbladder Carcinosarcoma and Intrahepatic Cholangiocarcinoma: A Rare Case Report

Zen Naito, et al.

INTRODUCTION: Gallbladder carcinosarcoma is extremely rare, with fewer than 100 cases reported from its first description in 1907 until 2022. Collision carcinoma is a type of synchronous carcinoma in which 2 independently arising tumors come into contact or partially invade each other.

Successful Management of Occult Breast Cancer with a Background of Anti-Melanoma Differentiation-Associated Gene 5 Antibody-Positive Interstitial Pneumonia: A Case Report

Mikako Ishii, et al.

INTRODUCTION: Anti-MDA5 (melanoma differentiation-associated gene 5) antibody-positive dermatomyositis is a severe subtype of dermatomyositis associated with rapidly progressive interstitial lung disease, which carries an extremely high mortality rate. Prompt diagnosis and therapeutic intervention are crucial for survival. Here, we report a rare case of occult breast cancer in a patient with anti-MDA5 antibody-positive associated interstitial pneumonia. Following the control of the lung disease with immunosuppressive therapy, the patient successfully underwent neoadjuvant chemotherapy (NAC) and curative surgery.

A Case of Shunt Vessel Closure for Symptomatic Congenital Portosystemic Shunt with Simultaneous Pancreatoduodenectomy

Ayano Kakimoto et al.

INTRODUCTION: Congenital portosystemic shunt (CPSS) is a condition in which portal blood flow bypasses the liver and directly enters the systemic circulation. CPSS is often diagnosed during childhood, but it can also be incidentally diagnosed in adulthood during imaging for other conditions. Reports of surgical treatment of CPSS in adult patients are rare.

Ileo-Ileal Knot with Three Closed Loops: A Case Report and Review of Pathophysiology

Ryogo Ito et al.

INTRODUCTION: The ileo-ileal knot is a rare condition in which 2 ileal loops form a knot, leading to obstruction, ischemia, and the need for urgent surgical intervention. It is challenging to diagnose preoperatively, with 2 closed loops on CT scan as its characteristic feature. This case revealed 3 nearly situated closed loops, which offers insights into the diagnosis and management of the ileo-ileal knot.

Rare Case of Additional Ileocecal Resection for Ascending Colon Cancer with R1 Resection due to Advanced Perineural Invasion

Yoshiaki Kanemoto, et al.

INTRODUCTION: Perineural invasion (PNI) has been cited as an independent prognostic factor in colorectal cancer. We report the first case of an additional resection after ileocecal resection due to advanced lateral extension of PNI, with a review of the literature.

Postoperative Intra-Pouch Mucosal Bridge Formation in a Child with Ulcerative Colitis

Yuhki Koike, et al.

INTRODUCTION: Restorative proctocolectomy with construction of an ileal J-pouch anal anastomosis is an established gold standard procedure for managing ulcerative colitis. One of the reported complications is a residual mucosal bridge as a result of leaving an apical bridge remnant when constructing the ileal J-pouch. However, now that the surgical procedure is well established, such complications rarely occur.

Primary Cardiac Myxofibrosarcoma: A Case Report

Takuya Matsushiro, et al.

INTRODUCTION: Primary cardiac tumors are rare, with malignant myxofibrosarcoma cases being particularly uncommon, while cardiac myxoma is a common diagnosis in clinical practice. We present a case of cardiac myxofibrosarcoma, whose clinical course was quite unusual.

Navigating the Challenges of Persistent Left Superior Vena Cava in the Catheterization of Peripherally Inserted Central Catheter Port: A Case Study

Takeshi Nakayama, et al.

INTRODUCTION: Persistent left superior vena cava (PLSVC), which is asymptomatic and occurs in 0.3%–0.5% of the general population, is typically detected incidentally but can complicate cardiac procedures owing to its potential to cause arrhythmias. This condition involves an additional venous return pathway to the right atrium, which can alter the cardiac anatomy and is associated with other cardiac aortic anomalies.

Benign Cystic Mesothelioma of the Peritoneum Arising at the Greater Omentum in a 14-Year-Old Boy

Yutaka Hirayama, et al.

INTRODUCTION: Mesothelioma arises from mesothelial cells. This tumor is very rare among pediatric abdominal neoplasms. We herein report an extremely rare case of acute abdomen with cystic mesothelioma of the peritoneum in a child.

Laparoscopic Intra-Mediastinum Omental Filling Repair for Spontaneous Esophageal Rupture: A Case Report

Demba Ishimine, et al.

INTRODUCTION: Spontaneous esophageal rupture is a rare but life-threatening condition with a high mortality rate. While conservative and endoscopic therapies have been reported, surgical treatment remains essential. The optimal approach involves esophageal defect repair and mediastinal drainage, which is performed via laparotomy, thoracotomy, laparoscopy, or a combination of these techniques. We report a case of laparoscopic intramediastinal omental filling for a spontaneous esophageal rupture that was challenging to close.

Cholangiolocarcinoma with Ductal Plate Malformation Pattern: A 6-Year Follow-Up

Yuta Ushida, et al.

INTRODUCTION: Cholangiolocarcinoma (CLC) with ductal plate malformation (DPM) is a rare primary liver cancer originating from the canals of Hering. It often exhibits intermediate behavior between hepatocellular carcinoma and intrahepatic cholangiocarcinoma. Diagnosing CLC with DPM is challenging due to overlapping imaging features with other liver malignancies.

Left S3 + S8 Segmentectomy with Rare Interlobar A3 Vascular Anomaly: A Case Report

Hiroki Imabayashi, et al.

INTRODUCTION: Segmentectomy is being accepted as a valid operative procedure for small peripheral non-small cell lung cancer. Understanding pulmonary artery (PA) variations is essential to ensure safe and reliable surgeries. Herein, we report a case of left S3 and S8 segmentectomy involving a complete interlobar branch of the left A3, a relatively rare anomaly reported in less than 0.56% of cases in previous studies.