McKittrick Wheelock syndrome secondary to adenocarcinoma of the rectum: case report and diagnostic considerations

Introduction: McKittrick-Wheelock syndrome is a rare entity characterized by chronic diarrhea, acute kidney injury, and hydroelectrolytic imbalance associated with a large rectal tumor, frequently a villous adenoma. Case report: A 69-year-old male with chronic diarrhea with mucus. He underwent a colonoscopy with biopsies, reporting adenocarcinoma of the rectum in situ, and underwent a robot assisted intersphincteric resection with colo-anal anastomosis and a protecitive ileostomy. Discussion: Described in 1954, this syndrome is manifested by electrolyte imbalance and acute renal injury secondary to diarrhea associated with a rectal villous adenoma, often with long lasting symptoms. The most frequent symptom being watery diarrhea with mucus. The definitive treatment consists of surgical resection. Conclusion: Although this is a rare pathology, it should be considered as a differential diagnosis in cases of chronic diarrhea associated with water and electrolyte disorders. (AU)

Current and Advanced Applications of Gadoxetic Acid-enhanced MRI in Hepatobiliary Disorders.

Gadoxetic acid is an MRI contrast agent that has specific applications in the study of hepatobiliary disease. After being distributed in the vascular and extravascular spaces during the dynamic phase, gadoxetic acid is progressively taken up by hepatocytes and excreted to the bile ducts during the hepatobiliary phase. The information derived from the enhancement characteristics during dynamic and hepatobiliary phases is particularly relevant in the detection and characterization of focal liver lesions and in the evaluation of the structure and function of the liver and biliary system. The use of new MRI sequences and advanced imaging techniques (eg, relaxometry, multiparametric imaging, and analysis of heterogeneity), the introduction of artificial intelligence, and the development of biomarkers and radiomic and radiogenomic tools based on gadoxetic acid-enhanced MRI findings will play an important role in the future in assessing liver function, chronic liver disease, and focal liver lesions; in studying biliary pathologic conditions; and in predicting treatment responses and prognosis. © RSNA, 2023 Quiz questions for this article are available in the supplemental material.

Safety and usefulness of fluorescence imaging using methylene blue as a fluorophore in a Japanese population with hepatobiliary and pancreatic diseases: A phase I study.

BACKGROUND: Methylene blue (MB) has been used to treat methemoglobinemia. Recently, a fluorescence imaging technique using MB as a fluorophore was used in several region but still not in hepatobiliary and pancreatic surgery; thus, information on the safety of intraoperative fluorescence imaging using MB in a healthy Japanese population is lacking. We aimed to evaluate the usefulness of MB fluorescence imaging in patients undergoing hepatobiliary and pancreatic surgery and the safety of intraoperative administration of MB in patients without methemoglobinemia. METHODS: Eighteen patients undergoing hepatobiliary and pancreatic surgery were enrolled. We developed and used a fluorescence imaging system to visualize MB as fluorescence. The fluorescence intensity of the blood vessels, tumors, liver, and intestine were measured. The primary endpoint was the ability of the MB fluorescence imaging to visualize vessels and tumors with fluorescence. The secondary endpoint was the safety of fluorescence imaging using MB in patients without methemoglobinemia. RESULTS: For the 18 patients undergoing MB fluorescence imaging, no intraoperative and postoperative complications related to MB administration occurred. Seventeen patients (94%) successfully visualized the target object as fluorescence by MB fluorescence imaging, including 100% of neuroendocrine tumors (four tumors) and peripancreatic vessels (n = 13). CONCLUSION: The administration of MB and application of fluorescence imaging using MB can visualize blood vessels and pancreatic neuroendocrine neoplasms. And it also showed the safety of using MB as a fluorophore in Japanese patients without methemoglobinemia.

IMPACT OF DIAGNOSTIC AND INTERVENTIONAL ENDOSCOPIC ULTRASONOGRAPHY IN CHILDREN.

BACKGROUND: Endoscopic ultrasonography is used in the diagnosis and treatment of digestive diseases in adults. In children, its use is limited due to a lack of available expertise. OBJECTIVE: This study aimed to evaluate the clinical impact of endoscopic ultrasonography on diagnostic and therapeutic strategy changes in pediatric patients. METHODS: Over ten years, this study retrospectively and consecutively analyzed children aged ≤18 years who underwent endoscopic ultrasonography because of inconclusive imaging or laboratory tests. The indications, results, occurrence of adverse events, and clinical impact of the procedures were analyzed. The clinical impact was classified as major (when the findings led to changes in diagnosis and management), minor (change in diagnosis but not in management), or none (no change in diagnosis or management). RESULTS: Overall, 107 children [77 (72%) of whom were female; mean age: 11.7 ± 4 years] underwent upper [102 (95.3%)] and lower [5 (4.7%)] endoscopic ultrasonography; 64 (58%) patients underwent diagnostic endoscopic ultrasonography, and 43 (42%) underwent interventional endoscopic ultrasonography. Endoscopic ultrasonography was used to investigate pancreaticobiliary, gastric, rectal, esophageal, duodenal, and mediastinal diseases in 81 (76%), 14 (13%), 5 (4.6%), 3 (2.8%), 2 (1.8%), and 2 (1.8%) patients, respectively. The clinical impact was significant in 81% of the children. Major and no clinical impact on pancreaticobiliary, gastrointestinal diseases, and mediastinal masses occurred in 50 (62%) and 13 (16%), 13 (54%) and 9 (37%), and 2 (100%) and 0 (0%) of the patients, respectively. CONCLUSION: This study evaluated the impact of diagnostic and interventional endoscopic ultrasonography in pediatric patients. When clinically and appropriately indicated, these procedures are safe and effective diagnostic or therapeutic interventions in pediatric patients with gastrointestinal or pancreaticobiliary disorders.

Diagnostic accuracy of three-dimensional contrast-enhanced ultrasound for focal liver lesions: A protocol for systematic review and meta-analysis.

BACKGROUND: Contrast-enhanced ultrasound (CEUS) examination is a well-established technique for this purpose with several unique advantages. It is a real-time technology with high temporal resolution. With its unique ability to detect microvascular perfusion, it helps in better characterization of FLL.[1-4] Three-dimensional (3D) CEUS with quantitative analysis is updated in recent years. 3D-CEUS is a new ultrasonic diagnostic technique, which can observe the nourishing vessels of lesions from multiple angles. Previous studies showed that 3D-CEUS can detect tumor nourishing vessels to differentiate benign from malignant focal liver lesions (FLLs). However, the results of these studies have been contradictory. Therefore, this meta-analysis tested the hypothesis that 3D-CEUS is accurate in distinguishing benign and malignant FLLs. METHODS: We will search PubMed, Web of Science, Cochrane Library, and Chinese biomedical databases from their inceptions to the April 30, 2021, without language restrictions. Two authors will independently carry out searching literature records, scanning titles and abstracts, full texts, collecting data, and assessing risk of bias. Review Manager 5.2 and Stata14.0 software will be used for data analysis. RESULTS: This systematic review will determine the accuracy of 3D-CEUS in the differential diagnosis between benign and malignant FLLs. CONCLUSION: Its findings will provide helpful evidence for the accuracy of 3D-CEUS in the differential diagnosis between benign and malignant FLLs. SYSTEMATIC REVIEW REGISTRATION: INPLASY202150096.

Approach to Abdominal Imaging in 2022.

Abdominal pain represents 5% to 7% of all emergency department presentations. Many patients require imaging for diagnosis, and choosing the appropriate imaging modality is a crucial decision point. Modern medicine offers a fantastic array of options including abdominal radiograph, computed tomography, MRI, and ultrasonography, but the plethora of alternatives can be paralyzing. This article introduces the commonly available modalities, discusses the advantages and disadvantages, and presents current recommendations for commonly diagnosed conditions.

Hepatobiliary morbidities detected by ultrasonography in Opisthorchis viverrini-infected patients before and after praziquantel treatment: a five-year follow up study.

Infection of the liver fluke, Opisthorchis viverrini (OV) is an important public health problem in northeast Thailand and adjacent countries, where people have a habit of eating raw or undercooked fish. A community case-control study was carried out with 8,936 participants from 89 villages, in Khon Kaen province, Thailand. There were 3,359 OV-infected participants all of whom underwent ultrasonography of upper abdomen for the evaluation of hepatobiliary morbidity. The participants with advanced periductal fibrosis (APF) by ultrasound (n = 785) were invited to undergo annual follow-up ultrasonography for five years after praziquantel treatment. The sonographer was blinded with respect to status of OV infection at each visit. The study findings revealed variability in the study population profile of the hepatobiliary morbidities before and after praziquantel treatment over the follow up interval. At the end of the study, 32 (30.8%) out of 104 participants showed no relapse of APF whereas, by contrast, 39 (37.5%) participants showed relapse or persistent APF since the outset of the study (≥ two consecutive visits). The APF in most follow-up visits was significantly associated with male sex, with intrahepatic duct stones, with the width of the gallbladder "pre" minus "post" fatty meal, and with the ratio of left lobe of the liver to aorta. Five cases of suspected cholangiocarcinoma were observed over the five years of follow-up. This long-term ultrasound follow-up study demonstrates a significant incidence of persistent APF in over one-third of opisthorchiasis cases after praziquantel treatment, findings that support the prospect of ongoing cholangiocarcinogenesis long after successful elimination of liver fluke infection among the population.

Ultra-low dose CT abdomen and pelvis for the detection of acute abdominal pathology in the emergency room: initial experience from an academic hospital.

PURPOSE: The aim of this study is to describe our initial experience using ULDCT performed in the emergency room in the evaluation of acute abdominal pathology. METHODS: Data from consecutive patients who underwent ULDCT for assessment of bowel obstruction, free intraperitoneal air, unexplained abdominal pain, or fecal loading for constipation between June 1, 2016 and March 31, 2017 was retrospectively assessed. Demographic data, radiation dose, CT findings, and clinical outcomes including performance of full dose contrast-enhanced CT (CECT), hospitalization, and surgery was collected. Concordance of ULDCT to CECT was calculated. RESULTS: ULDCT was performed in 325 patients (188 women and 137 men; mean age, 65.1 years). ULDCT detected acute abdominal pathology in 134/325 (41.2%), and in 89/134 (66.4%) it was concordant with the clinical working diagnosis. The average dose length product (DLP) was 101.6 mGy cm (range 51.7-614; median, 82.6). CECT was performed in 44/325 patients (13.5%). In 7/44 (15.9%), CECT identified discordant findings which likely impacted management. A greater proportion of patients were admitted to hospital after a positive ULDCT 99/137 (72.3%), compared to those with a negative study 81/188 (43.1%); p < 0.0001(Chi2, 27.30). Of those admitted to hospital, 11/99 (11.1%) with positive ULDCT had surgery compared to 1/81 (1.2%) with a negative ULDCT; p < 0.008 (Chi2, 6.98). CONCLUSION: With its high clinical yield and similar radiation dose, ULDCT appears as a suitable alternative to abdominal radiography for the detection of select acute abdominal pathology in the emergency room.

Double Guidewire Technique Using an Uneven Double Lumen Catheter for Endoscopic Ultrasound-Guided Interventions.

BACKGROUND: Endoscopic ultrasonography (EUS)-guided interventions are often performed using a single guidewire (SGW), but there are a few reports on the use of double guidewire (DGW) technique to facilitate multiple drainage placement during EUS-guided drainage of pancreatic fluid collections. This DGW technique may have advantages other than multiple drainage placement during EUS-guided interventions such as scope stabilization, support for stone extraction and device insertion. METHODS: Consecutive patients who underwent EUS-guided interventions between Feb 2012 and Apr 2019 were retrospectively reviewed. The rate and reasons of DGW technique, and clinical outcomes were evaluated. DGW technique was performed, using an uneven double lumen cannula (UDLC), which facilitates insertion of 0.025-in. and 0.035-in. guidewires. RESULTS: A total of 249 EUS-guided interventions were analyzed, and DGW technique was utilized primarily in 65 cases (25.7%) and as a salvage after failed SGW technique in 18 cases (7.1%). The reasons for DGW technique were 60 multiple drainage placement, 10 scope stabilization, 7 device insertion, 5 safety guidewire, and 4 antegrade stone removal. Insertion of UDLC and DGW was successful in 100%. Technical success rate of preplanned interventions was 92.7% (96.9% in primary DGW and 77.8% in salvage DGW technique). Adverse events were observed in 19.5% after DGW but were not related to DGW technique. CONCLUSIONS: DGW technique using UDLC during EUS-guided interventions was technically feasible and safe. In addition to multiple drainage insertion, it can potentially support complex EUS-guided interventions.

Clinical Utility of Carnett and closed eye sign in emergency department.

BACKGROUND: Carnett's sign (CAR) and Closed Eye sign (CE) have been suggested for use in the emergency department setting in the management of abdominal pain. The present study sought to determine the sensitivity/specificity of CAR and CE for pathological CT findings as a primary outcome and for subsequent hospital admission or surgical intervention as secondary outcomes in a community emergency department setting. METHODS: A convenience sample of adults (≥18 y) presenting with acute (<48 h) nontraumatic and non-postoperative abdominal pain determined by treating provider to warrant CT imaging were eligible for enrollment. Treating providers completed a datasheet describing physical examination findings prior to CT imaging. RESULTS: 320 patients were enrolled. 245/320 (76.5%) of enrolled patients had findings on CT Imaging. CAR+ was recorded in 145 and CAR- in 175 patients. CE+ was in 187 and CAR- in 133 patients. Sensitivity and specificity of CAR- for hospital admission was 42.2% and 38.9% and for surgery-44.8% and 43.1%. Sensitivity and specificity of CE- for hospital admission was 28% and 51.6% and for surgery-25.9% and 55%. CAR+ patients were more likely to be admitted or undergo surgery as compared to CAR-. CE+ patients were more likely to be admitted or undergo surgery as compared to CAR-. There were no differences in frequency of pathological CT findings between CAR+ and CAR- or CE+ and CE- patients. CONCLUSION: CAR and CE are neither sufficiently sensitive nor specific for use in the emergency department setting. CT findings were equally likely in CAR+ and CAR- patients. CT Findings were also equally likely in CE+ and CE- patients.

Cystic and alveolar echinococcosis of the hepatobiliary tract - the role of new imaging techniques for improved diagnosis.

Cystic echinococcosis (CE) or hydatidosis (hydatid cysts) is an infection with a wide spectrum of manifestations, from symptomatic infection to fatal disease. Ultrasound (US) allows screening, diagnosis, differential diagnosis, treatment guidance and follow-up of CE under many circumstances. Hydatid cysts are predominantly observed in the liver. Herewith we present a review to demonstrate established and innovative imaging features of CE of the hepatobiliary tract.

Post-lung transplantation abdominopelvic complications: the role of multimodal imaging.

Lung transplantation (LT) is an established method for treating end-stage lung disease. Although most of the post-lung transplant imaging surveillance is focused on chronic lung allograft rejection, abdominopelvic complications have been reported in 7-62% of patients. The reported wide range of post-LT abdominopelvic complications is thought to be secondary to lack of current standardized definitions. These complications encompass a heterogeneous group of disorders including upper and lower gastrointestinal (GI) disorders, inflammatory conditions of solid organs, lymphoproliferative disorders, and neoplasms; each with varying pathophysiology, timing, severity, and treatment. Clinical manifestations of these complications may overlap or be masked by immunosuppression; therefore, imaging plays a paramount role in the early management and treatment.

Use of Eovist in Pediatric Patients: Pearls and Pitfalls.

Magnetic resonance imaging is excellent at characterizing pediatric hepatobiliary pathology. Noncontrast MRI is helpful due to T2 hyperintensity associated with bile, but contrast enhancement offers additional means of lesional characterization. In particular, hepatocyte-specific contrast agents such as gadoxetate disodium (Eovist) exhibit partial hepatobiliary excretion which may be leveraged in these contexts. In this review, we will discuss gadoxetate disodium usage, including a sample-imaging protocol, and demonstrate applications and limitations in the pediatric population.

Congenital Cystic Lesions of the Bile Ducts: Imaging-Based Diagnosis.

Congenital cystic lesions of the bile ducts represent a spectrum of liver and biliary system lesions, resulting from abnormal embryologic development of the ductal plate. These disorders include Caroli disease, choledochal cysts, autosomal dominant polycystic liver disease, congenital hepatic fibrosis, and biliary hamartomas. Each disorder carries a peculiar clinical presentation, prognosis, and risk of complications. Knowledge of radiological findings of fibropolycystic liver diseases is crucial for their appropriate detection and for differential diagnosis with other similar hepatic cystic lesions, in order to avoid relevant misdiagnosis. The aim of this review is to provide an illustrative summary of the most relevant imaging findings of these conditions as encountered on ultrasound, computed tomography, and magnetic resonance imaging, and provide pearls for imaging-based differential diagnosis.

Evaluation of the performance of two neutral oral contrast agents in computed tomography enterography: A randomized controlled trial.

OBJECTIVE: To compare the performances, tolerability and acceptability of mannitol and polyethylene glycol (PEG) as oral contrast agents in patients undergoing computed tomography enterography (CTE). METHODS: Patients aged 18-75 years indicated for CTE were randomized to receive either mannitol or PEG as contrast agents. The coronal reconstructed images of each abdominal quadrant were assessed for maximum distention, proportion of distended bowel loops, presence of inhomogeneous contents and visibility of the small bowel wall. Overall subjective imaging quality assessment and patients' tolerability and acceptability were recorded. RESULTS: Seventy patients were enrolled and randomized into two groups. In the per-protocol analysis, no significant differences in imaging quality was found in bowel distention maximum diameter, wall visibility and intestinal homogeneity (all P > 0.05). The mean nausea score was lower in the mannitol group (0 [0-0] vs 1.0 [0-3.0], P < 0.001). Mannitol was superior to PEG in taste (9.0 [8.0-10.0] vs 7.0 [5.0-8.0], P < 0.001), patients' willingness to reuse the drug (9.0 [8.0-10.0] vs 8.0 [7.0-9.0], P = 0.036), satisfaction (9.0 [8.0-10.0] vs 8.0 [7.0-9.0], P = 0.022) and ease of completion (9.0 [8.0-9.3] vs 8.0 [6.5-9.0], P = 0.030). CONCLUSIONS: Both mannitol and PEG provided good bowel distention and visualization of the bowel wall. However, mannitol was significantly superior to PEG in patients' tolerability and acceptability.

Biliary Leakage After Hepatobiliary and Pancreatic Surgery: A Classification System to Guide the Proper Percutaneous Treatment.

PURPOSE: To investigate the effectiveness of percutaneous approaches to treat bile leak and to propose an anatomical classification of biliary fistula to guide the most appropriate percutaneous approach. MATERIALS AND METHODS: Fifty-six patients with bile leakage after hepatobiliary surgery were included. Based on preoperative images and postoperative fistulogram images, three categories of bile leakage were defined. Every category was treated with non-surgical approaches (internal-external percutaneous drainage, percutaneous/endoscopic biliodigestive anastomosis with rendez-vous technique and biliodigestive percutaneous anastomosis with totally radiologic rendez-vous). RESULTS: In 44/56 (78%) patients, anatomical conformation was "direct communication" (bile ducts upstream from the leak present a direct communication with downstream ducts) and their treatment was conventional percutaneous drainage. In 5/56 (9%), anatomical conformation was "indirect communication" (bile ducts upstream from the leak communicate with downstream ducts through a bile collection) and treatment was percutaneous/endoscopic rendez-vous technique. In 7/56 (12%), anatomical conformation was "no communication" (ducts upstream from the leak are completely excluded from ducts downstream) and treatment was totally radiologic rendez-vous. In 54/56 (96%) during the follow-up, cholangiography revealed complete resolution of the leak without residual stenosis and drains were removed. Complications occurred in 12/56 (21%). Procedure-related mortality was 0%. Ten patients, after > 6 months from resolution of their fistula and drain removal, died due to cancer recurrence. Currently, 44/56 patients (77%) at long-term follow-up (> 12 months) are alive, without bile leak. CONCLUSION: Our classification helps to choose the most proper percutaneous approach in all kinds of bile leakage, even in severe cases; these are safe techniques with a high success rate.

OCCUPATIONAL RADIATION DOSE PERFORMING HEPATOBILIARY MINIMALLY INVASIVE PROCEDURES IN CHILDREN WEIGHING LESS THAN 20 kg.

Our objective is to retrospectively evaluate the effective dose (E) of operators performing pediatric Hepatobiliary Minimally Invasive Procedures (HMIP). Between October 2015 and December 2017, 58 consecutive HMIP were performed on 26 children weighing less than 20 kg (mean 12.3 kg, median 13 kg, range 2.4-20 kg). About 31 vascular procedures (n = 9 hepatic venograms with/without stenting; n = 9 retrograde wedge portography; n = 8 transhepatic portography with angioplasty and/or stenting and n = 5 hepatic arteriography/embolization) and 27 non-vascular procedures (n = 6 percutaneous transhepatic biliary drainage (PTBD); n = 3 bilioplasty; n = 15 biliary catheter change and n = 3 cholangiogram) were performed. Electronic personal dosimeters were used to measure radiation doses to the interventional radiologist, radiographer and anesthesia nurse. The results shows the highest mean effective dose: interventional radiologist's in PTBD (1.18 µSv); radiographer's in hepatic veins phlebography with/without stenting (0.25 µSv) and nurse's in hepatic arteriography/embolization (0.26 µSv). Operators' E can vary depending on the complexity of procedure performed and the position of the operators within the angiosuite.