Surgical Case Reports

Unicentric Castleman Disease Presenting with a Ruptured Pseudoaneurysm within the Tumor: A Case Report

Toshiki Matsui, et al.

INTRODUCTION: Castleman disease is a lymphoproliferative disorder of unknown etiology, typically reported as a hypervascular tumor. Here, we report the first known case of unicentric Castleman disease in which a pseudoaneurysm developed within the tumor and ruptured spontaneously.

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Spontaneous Regression of Intrahepatic Adenocarcinoma after Needle Biopsy: A Case Report and Literature Review

Koetsu Inoue, et al.

INTRODUCTION: Spontaneous tumor regression (STR) is a rare phenomenon in which cancer cells partially or completely disappear without treatment. We report a case of intrahepatic cholangiocarcinoma demonstrating STR following endoscopic ultrasonography-guided fine-needle aspiration (EUS-FNA).

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Fulminant Food Aspiration-Induced Pneumonia Leading to Tension Pyopneumothorax after Proctectomy: An Autopsy Case

Ryuta Nakao, et al.

INTRODUCTION: Postoperative aspiration pneumonia is an uncommon but severe pulmonary complication, particularly in older adults with cognitive impairment. We report an autopsy case of fulminant aspiration pneumonia, caused by food aspiration following colorectal cancer surgery, that progressed to tension pyopneumothorax.

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Robotic-Assisted Sigmoidectomy with D3 Lymphadenectomy for Sigmoid Colon Cancer in a Patient with Situs Inversus Totalis: A Case Report

Kazuhito Minami, et al.

INTRODUCTION: Situs inversus totalis (SIT) is a rare congenital anomaly characterized by complete mirror-image transposition of thoracic and abdominal organs. Although laparoscopic colectomy in SIT has been increasingly reported, the reversed anatomy and inherent limitations of laparoscopy make such procedures technically demanding. Robotic-assisted surgery may overcome these issues by providing enhanced ergonomics and intuitive instrument control, yet reports in SIT remain scarce.

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Jejunogastric Intussusception after Pylorus Resecting Pancreaticoduodenectomy: A Rare Case Report and Review of the Literature

Yuma Tamaki, et al.

INTRODUCTION: Jejunogastric intussusception is a rare complication that can occur following gastrectomy or gastric bypass surgery. The occurrence of intestinal intussusception after pancreaticoduodenectomy (Child reconstruction) has been reported in very few cases in the literature.

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Squamous Cell Carcinoma Originating from a Dermoid Cyst Located between the Upper Rectum and Prostate: A Case Report

Takao Tsukahara, et al.

INTRODUCTION: Pelvic squamous cell carcinoma (SCC) originating from a dermoid cyst (DC) is extremely rare. Here, we report the first case of SCC that developed in the anterior rectal area.

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Laparoscopic Resection of a Large Jejunal Diverticulum-Like Gastrointestinal Stromal Tumor: A Case Report

Ryosuke Mizuno, et.al

INTRODUCTION: Gastrointestinal stromal tumors (GISTs) that present as large jejunal diverticulum-like lesions are exceedingly rare, with only 8 cases reported in the English literature to date. Notably, all previously documented cases were treated via open surgery. To our knowledge, this is the first report of successful laparoscopic resection of such a lesion. This case contributes novel insight into the management of rare GIST presentations and demonstrates the potential applicability of minimally invasive surgery.

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A Case of Invasive Ductal Carcinoma with Axillary Skip Metastasis Confined to the Interpectoral (Rotter’s) Lymph Node

Emiri Sugiyama, et al.

INTRODUCTION: Axillary skip metastasis is a rare phenomenon in breast cancer and is defined as metastasis to level II or III lymph nodes without involvement of level I nodes. Interpectoral (Rotter’s) nodes are situated between the pectoralis major and minor muscles and may occasionally be overlooked during sentinel node (SN) mapping. Reports of isolated interpectoral node metastases are rare. Here, we present a unique case of breast cancer with isolated interpectoral node involvement despite a negative sentinel lymph node, underscoring the clinical implications of preoperative imaging and surgical planning.

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A Solitary Duodenal Metastasis from Transverse Colon Cancer Detected Six Years after Curative Resection: A Case Report

Shingo Otsuji, et al.

INTRODUCTION: Recurrence of colon cancer after 5 years or longer from primary surgery is relatively rare and furthermore, isolated metastasis to the duodenum is extremely rare.

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Laparoscopic Sugarbaker Repair of Parastomal Hernia with Gastric Incarceration: A Case Report and Review of the Literature

Masatsugu Kojima, et al.

INTRODUCTION: Parastomal hernia is a common complication of stoma creation; however, gastric involvement is extremely rare, with only approximately 2 dozen cases reported. Gastric incarceration in a parastomal hernia can cause severe complications, including gastric outlet obstruction and ischemia, and requires timely surgical management.

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A Case of Late Radiation-Induced Enteritis with Enterolith Caused Enterocutaneous Fistula

Kiyoe Takai, et al.

INTRODUCTION: Radiotherapy for pelvic malignancies contributes to improved patient survival. However, early and late radiation-induced complications are increasing and cause significant impairment of quality of life. We reported a case of late radiation-induced enteritis associated with an enterocutaneous fistula suggestive of enterolith, which required 2 times of surgical treatments.

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Hepatectomy inside the Portal Ring in a Patient with Absence of Portal Vein Bifurcation: A Case Report

Atsuhito Takagi, et al.

INTRODUCTION: Absence of portal vein bifurcation (APB) is a rare congenital anomaly in which the main portal vein does not bifurcate at the hepatic hilum. After giving off posterior and anterior sectoral branches, the trunk curves ventrally around the middle hepatic vein—forming a so-called “portal ring”—and finally enters the umbilical portion of the left portal vein. Hepatectomy performed inside this ring risks compromising perfusion if the portal trunk is injured. We report a case in which anatomical segmentectomy (S4a+S5) was performed for the gallbladder carcinoma with this portal vein anomaly.

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