Liver Abscess Caused by Klebsiella oxytoca with Hepatic Artery Pseudoaneurysm:A Case Report

Hepatic artery pseudoaneurysm is a rare but potentially life-threatening condition that usually occurs after trauma. Early recognition and prompt management are essential for preventing catastrophic consequences, such as hemoperitoneum. We report a rare case of liver abscess caused byKlebsiella oxytoca resulting in hepatic artery pseudoaneurysm without iatrogenic injury. The unique feature of the present case is that the abscess cavity itself became a pseudoaneurysm as a result of fistula formation with the hepatic artery. Vascular complications should be considered in patients with unfavorable clinical course even in the absence of iatrogenic injury. Endovascular treatment is safe and effective.

A Case Report of Extramedullary Myeloma Mimicking Lymphoma with Extensive Abdominal Involvement

Extramedullary myeloma refers to the presence of myeloma deposits outside the skeletal system and typically indicates a poor prognosis associated with shorter overall survival and progression- free survival. We report a case of extramedullary myeloma with extensive, abdominal multi-organ involvement mimicking lymphoma at initial diagnosis. Bulky retroperitoneal masses with severe diffusion restriction and patency of encased vessels can be MR findings of both myeloma and lymphoma. Radiologic findings such as arterial hyperenhancement, obstructive uropathy, and the lack of associated lymphadenopathy may favor a diagnosis of myeloma over lymphoma.

Left-Sided Cisterna Chyli: a Case Report on a Rare Normal Anatomic Structure

The cisterna chyli, a dilated lymphatic sac in the retrocrural space, is usually located to the right of the aorta. We report a case of a left-sided cisterna chyli, which was incidentally detected on the radiologic examinations of a preoperative workup for cholangiocarcinoma. Computed tomography (CT) and magnetic resonance (MR) images revealed a cisterna chyli measuring 2.5 cm in length in the left retrocrural space. The dilated lumbar lymphatics joined with the cisterna chyli, which was continuous with the left-sided thoracic duct. To the best of our knowledge, this is the second antemortem case of a left-sided cisterna chyli in literature. The cisterna chyli can mimic retrocrural lymphadenopathy, solid tumor with cystic degeneration, abscess or hematoma. The left-sided cisterna chyli should be referred to as a structure so as to be cautious in surgical approach.

Computed Tomography Findings of Thrombosis and Aneurysm of the Portal Venous System

The portal venous system comprises all of the veins draining the abdominal part of the digestive tract, and tributaries of the portal vein are the splenic, superior mesenteric, left and right gastric vein, paraumbilical and cystic veins. The portal vein could be occluded in various clinical settings that may cause portal venous system thrombosis. And rarely aneurysms of the portal venous system may be presented. Multiphasic contrast enhanced computed tomography is a useful tool for both perfusion abnormalities and morphologic analysis of the portal venous system and the liver and it enables discrimination between bland and neoplastic portal vein thrombi.

CT Findings of Colonic Complications Associated with Colon Cancer

A broad spectrum of colonic complications can occur in patients with colon cancer. Clinically, some of these complications can obscure the presence of underlying malignancies in the colon and these complications may require emergency surgical management. The complications of the colon that can be associated with colon cancer include obstruction, perforation, abscess formation, acute appendicitis, ischemic colitis and intussusception. Although the majority of these complications only rarely occur, familiarity with the various manifestations of colon cancer complications will facilitate making an accurate diagnosis and administering prompt management in these situations. The purpose of this pictorial essay is to review the CT appearance of the colonic complications associated with colon cancer.

Epstein-Barr Virus-Associated Lymphoepithelioma-Like Gastric Carcinoma Presenting as a Submucosal Mass: CT Findings with Pathologic Correlation

A lymphoepithelioma-like carcinoma, characterized by a carcinoma with heavy lymphocyte infiltration, is one of the histological patterns observed in patients with Epstein-Barr virus (EBV)-associated gastric carcinoma. Less than half of invasive carcinomas with lymphoepithelioma-like histology can grow to make a submucosal mass. These tumors generally have a better prognosis than conventional adenocarcinomas. We report a case of an EBV-associated lymphoepithelioma-like gastric carcinoma that presented as a submucosal mass on multi-detector (MD) CT and correlate them with the pathology.

US and CT Findings of Splenic Hydatid Cyst: A Case Report

Hydatid disease is a parasitic infection caused by the larvae of the cestode worms Echinococcus. In humans, the most commonly affected organ is the liver, the next second common organ is the lung. The third common affected organ is the spleen. In the case of splenic hydatid cyst, most cysts remain clinically silent and are diagnosed incidentally or when complications occur. We experienced a case of splenic hydatid cyst in a 28-year-old man. The patient complained of abdominal pain for 1 month. Abdominal ultrasound revealed a cystic lesion with daughter cysts in the spleen. The CT imaging also showed a cystic lesion with daughter cysts. We diagnosed it as a splenic hydatid cyst which was confirmed by pathology after surgery.

Foreign Body Granulomas Simulating Recurrent Tumors in Patients Following Colorectal Surgery for Carcinoma: a Report of Two Cases

We report here two cases of foreign body granulomas that arose from the pelvic wall and liver, respectively, and simulated recurrent colorectal carcinomas in patients with a history of surgery. On contrast-enhanced CT and MR images, a pelvic wall mass appeared as a well-enhancing mass that had invaded the distal ureter, resulting in the development of hydronephrosis. In addition, a liver mass had a hypointense rim that corresponded to the fibrous wall on a T2-weighted MR image, and showed persistent peripheral enhancement that corresponded to the granulation tissues and fibrous wall on dynamic MR images. These lesions also displayed very intense homogeneous FDG uptake on PET/CT.

Congenital Intrahepatic Portosystemic Shunts

Intrahepatic portosystemic shunts are an anomalous connection between the portal vein and hepatic vein/IVC, which may be either congenital or acquired secondary to liver cirrhosis or portal hypertension. Cases of congenital intrahepatic shunts are usually encountered in children and may spontaneously resolve. We report 5 cases of congenital intrahepatic portosystemic shunts in neonates and an adult.

Mucocele of the Remnant Appendix Following Incomplete Appendectomy: A Case Report

Appendiceal mucoceles are rare lesions. There has been only one report of a mucocele of the remnant appendix not communicating with the cecum. We report a remnant appendiceal mucocele following an incomplete incidental appendectomy, which presented as a lobulated cystic mass on ultrasonography and a cystic mass with an irregular wall on computed tomography. A borderline malignant mucinous tumor of the appendix was diagnosed.

Multi-Detector CT Findings of Primary Tubercular Appendicitis: A Case Report

The frequency of intestinal tuberculosis is relatively common; however, primary tuberculosis of the appendix remains a rarity. We report on a case of primary tuberculous appendicitis for which we obtained the MDCT images revealing thickening of the appendix and the surrounding lymphadenopathies.

Duplication of the Extrahepatic Bile Duct in Association with Choledocholithiasis as Depicted by MDCT

We report here on an extremely rare case of duplicated extrahepatic bile ducts that was associated with choledocholithiasis, and this malady was visualized by employing the minimum intensity projection images with using multi-detector row CT. The presence of duplicated extrahepatic bile ducts with a proximal communication, and the ducts were joined distally and they subsequently formed a single common bile duct, has not been previously reported.

Which Factors Influence the Detection of an Inflamed Appendix: Comparative Assessment of Ultrasonography and CT

PURPOSE: To compare and assess factors influencing the detection of an inflamed appendix by both ultrasonography (US) and CT. MATERIALS AND METHODS: We retrospectively analyzed US and CT findings of 58 patients with confirmed acute appendicitis (42 patients with perforation and 16 patients without perforation), in which both preoperative US and CT scans were performed. We compared the use of US and CT for the diagnostic accuracy of acute appendicitis, and determined the detection rate for an inflamed appendix. According to the location of the appendix, the amount of mesenteric fat content in lower abdominal cavity, the presence of cecal wall thickening, and the presence of pericecal fluid or an abscess, the use of US and CT were compared for the determination of the detection rate of an inflamed appendix. RESULTS: The diagnostic accuracies for US and CT for acute appendicitis in our study group were both 93.1%, and there was no difference between the use of the two modalities. Although the detection rate of an inflamed appendix was slightly higher for US (93.1%) than for CT (84.5%), the difference between the use of the two modalities was not significant (p > 0.05). There was no significant difference in the detection rate of an inflamed appendix between the use of US and CT according to location of appendix, the amount of mesenteric fat content and the presence of cecal wall thickening. A pelvic location of the inflamed appendix and the presence of pericecal fluid or an abscess, were factors that significantly increased the detection rate for US than for CT (p < 0.05). CONCLUSION: The use of US for diagnosis of acute appendicitis is as useful as the use of CT. US is especially useful to detect an inflamed appendix more effectively than CT in cases where the appendix is in a pelvic location and presents with pericecal fluid or an abscess.

Giant Presacral Schwannoma: A Case Report

Most giant sacral schwannomas are associated with moderate to massive bone destruction before they extend into the presacral space. These lesions can, on rare occasions, manifest as a giant tumor in the presacral space without bone destruction. We report here on the image findings of a presacral giant schwannoma in a 65-year-old man. On ultrasound and CT, the tumor appeared as an inhomogenous, well-demarcated mass that demonstrated some cystic changes and peripheral calcifications without sacral bone destruction. On the MR imaging, the tumor showed as an inhomogeneous, encapsulating mass with low signal intensity on both the T1 and T2-weighted images, except for some areas that showed cystic change.

The Usefulness of the Transabdominal Ultrasonography as a Screening Examination in the Evaluation of the Patient with Suspicious Gastric Disease

PURPOSE: To evaluate the usefulness of transabdominal ultrasonography as a screening examination in patients with suspicious gastric disease. MATERIALS AND METHODS: We selected 141 patients with epigastric pain and who were found to have antral gastric wall thickening of more than 5 mm in transabdominal ultrasonography, and who underwent gastroscopy immediately following the ultrasonography examination, because we suspected that these patients had gastric disease. We measured the full thickness of the five layers of the gastric wall and evaluated the preservation of this fivelayered structure. We respectively compared the gastric wall thickness and the preservation of gastric layers in 26 normal, 91 gastritis, 12 gastric ulcer, and 12 gastric cancer patients, who were classified based on the gastroscopy results. RESULTS: The mean thicknesses of the gastric wall in the normal, gastritis, gastric ulcer and gastric cancer patients were 5.13+/-0.14 mm, 6.71+/-1.33 mm, 8.08+/-2.80 mm, and 12.45+/-3.70 mm, respectively. The gastric walls in the gastritis, gastric ulcer and gastric cancer patients were significantly thicker than that in the normal patients (p 0.01). Except for two patients with gastritis and three patients with gastric ulcer, the stratification of the gastric wall was preserved in all of the normal, gastritis and gastric ulcer patients, whereas it was disrupted in all of the patients with gastric cancer. CONCLUSION: Transabdominal ultrasonography in the fasting state may be a helpful and convenient modality, which can serve as a screening examination in the evaluation of gastric disease. Therefore, careful attention and effort are needed to evaluate the gastric wall during transabdominal ultrasonography.

Incidental Finding of a Precaval Right Renal Artery on CT: A Case Report

The right renal artery passing anterior to the inferior vena cava is a rare variant of the normal renal arterial anatomy, and identifying this anomaly is important for the planning of minimally invasive renal surgery. The presence of this precaval right renal artery was detected on the contrast-enhanced CT scan by identifying the right renal artery passing anterior to the inferior vena cava. We report here on a case of a precaval right renal artery as a main supplying artery, and this was incidentally found on CT.

Diagnosis of Annular Pancreas Using Minimum Intensity Projection of Multidetector Row CT: Case Report

Annular pancreas is a rare congenital abnormality characterized by a ring of pancreatic tissue encircling the second portion of the duodenum, and it is definitively diagnosed by endoscopic retrograde cholangiopancreatography. We present here a case of annular pancreas that was diagnosed by the minimum intensity projection technique of multidetector row CT. On the CT scan, the annular pancreas was demonstrated as the pancreatic tissue with an aberrant pancreatic duct encircling the duodenum.

Atypical Hepatic Hemangiomas with Multiple Calcifications Mimicking Hepatic Metastases: Case Report

Although hepatic hemangioma is the most common benign tumor of the liver, it is rarely associated with calcifications. We report on the case of an asymptomatic 58-year-old man in whom multiple hepatic masses containing calcifications were discovered incidentally at ultrasonography. The radiologic features mimicked those of multiple hepatic metastases.

CT Findings of Congenital Transmesenteric Hernia: Case Report

Transmesenteric hernia occurs usually in adult patients who had history of an abdominal surgery or blunt abdominal trauma. Congenital mesenteric defect is a relatively common cause of internal hernia in children. However, the report of CT findings of congenital transmesenteric hernia is relatively rare. Thus, we report a case of congenital transmesenteric hernia occurring in a 13-year-old girl with intestinal obstructive symptoms, and include the CT findings.

Radiologic Findings and Follow-Up Evaluation

In esophageal perforation, fistulous tracts commonly occur between the esophagus and mediastinal or pleural spaces, but rarely between the esophagus and bronchi. The clinical manifestations and radiologic findings of esophageal perforation are nonspecific, and diagnosis is the often delayed; esophagography is the standard technique for evaluation of its location and degree. CT is useful in demonstrating the extraluminal manifestations of esophageal perforation and for follow-up after medical treatment, and may depict the various manifestations of perforation, according to the causes.