Reliability of extracellular contrast versus gadoxetic acid in assessing small liver lesions using liver imaging reporting and data system v.2018 and European association for the study of the liver criteria.

BACKGROUND & AIMS: The diagnostic accuracy of Liver Imaging Reporting and Data System (LI-RADS) v.2018 and European Association for the Study of the Liver (EASL) criteria for the diagnosis of HCC have been widely evaluated, but their reliability should be investigated. We aimed to assess and compare the reliability of LI-RADS v.2018 and EASL criteria for the diagnosis of HCC using MRI with extracellular contrast agents (ECAs) and gadoxetic acid (GA) and determine the effect of ancillary features on LI-RADS reliability. APPROACH & RESULTS: Ten readers reviewed MRI studies of 92 focal liver lesions measuring <3 cm acquired with ECAs and GA <1 month apart from two prospective trials, assessing EASL criteria, LI-RADS major and ancillary features, and LI-RADS categorization with and without including ancillary features. Inter-reader agreement for definite HCC diagnosis was substantial and similar for the two contrasts for both EASL and LI-RADS criteria. For ECA-MRI and GA-MRI, respectively, inter-reader agreement was k = 0.72 (95% CI, 0.63-0.81) and k = 0.72 (95% CI, 0.63-0.80); for nonrim hyperenhancement, k = 0.63 (95% CI, 0.54-0.72) and k = 0.57 (95% CI, 0.48-0.66); and for nonperipheral washout, k = 0.49 (95% CI, 0.40-0.59) and k = 0.48 (95% CI, 0.37-0.58) for enhancing capsule. The inter-reader agreement for LI-RADS after applying ancillary features remained in the same range of agreement. CONCLUSIONS: Agreement for definite HCC was substantial and similar for both scoring systems and the two contrast agents in small focal liver lesions. Agreement for LI-RADS categorization was lower for both contrast agents, and including LI-RADS ancillary features did not improve agreement.

[Indications and results of pancreatic metastasis resection. Experience in the Hospital Universitario de Bellvitge]. / Indicaciones y resultados de la resección de metástasis pancreáticas. Experiencia en el Hospital Universitario de Bellvitge.

OBJECTIVE: To analyse the indications and results of pancreatic metastasis resection in a university hospital. PATIENTS AND METHODS: An analysis was performed on a prospective database from 1990 to 2010. The clinical-pathological and perioperative details, as well the follow-up results were analysed. RESULTS: Of the 710 pancreatic resections performed, 7 cases (0.99%) were due to a metastasis in the pancreas. The mean age of the patients was 53.3 years (20-77 years), and 5 were male and 2 were women. Five (70%) patients were asymptomatic. The origin of the metastasis was: colon (n=3), kidney (n=2), jejunum (n=1), and testicle (n=1). In 4 cases they were situated in the head, 2 in the tail, and one in the body. The metastases were metachronous in 4 (57%) patients and the disease free interval was 29 months (17-48). There were 3 cases (43%) of synchronous metastases, with a mean recurrence-free time of 14 months, and survival of 21.6 months. This was lower than that of patients with metachronous metastases, which was 27.8 months and with a survival of 32 months, respectively. The overall disease free interval and survival was 21.85 months and 27.5 months, respectively. CONCLUSION: Resection of pancreatic metastases can extend survival in selected patients.

Preoperative staging of patients with liver metastases of colorectal carcinoma. Does PET/CT really add something to multidetector CT?

PURPOSE: This study was designed to determine prospectively whether the systematic use of PET/CT associated with conventional techniques could improve the accuracy of staging in patients with liver metastases of colorectal carcinoma. We also assessed the impact on the therapeutic strategy. METHODS: Between 2006 and 2008, 97 patients who were evaluated for resection of LMCRC were prospectively enrolled. Preoperative workup included multidetector-CT (MDCT) and PET/CT. In 11 patients with liver steatosis or iodinated contrast allergy, MR also was performed. Sixty-eight patients underwent laparotomy. Sensitivity, specificity, positive predictive value (PPV), and negative predictive values for hepatic and extrahepatic staging of MDCT and PET-CT were calculated. RESULTS: In a lesion-by-lesion analysis of the hepatic staging, the sensitivity of MDCT/RM was superior to PET/CT (89.2 vs. 55%, p < 0.001). On the extrahepatic staging, PET/CT was superior to MDCT/MR only for the detection of locoregional recurrence (p = 0.03) and recurrence in uncommon sites (p = 0.016). New findings in PET/CT resulted in a change in therapeutic strategy in 17 patients. However, additional information was correct only in eight cases and wrong in nine patients. CONCLUSIONS: PET/CT has a limited role in hepatic staging of LMCRC. Although PET-CT has higher sensitivity for the detection of extrahepatic disease in some anatomic locations, its results are hampered by its low PPV. PET/CT provided additional useful information in 8% of the cases but also incorrect and potentially harmful data in 9% of the staging. Our findings support a more selective use of PET/CT, basically in patients with high risk of local recurrence.

Primary hepatic leiomyoma: case report.

The patient is a previously healthy 28-year-old woman with incidentally detected focal liver lesion. On CT, the tumor showed brisk arterial enhancement and persistent hyperenhancement on portal and delayed phases. Histological study showed spindle cells without atypia and immunohistochemical study was consistent with leiomyoma.

Organ-preserving surgery for benign lesions and low-grade malignancies of the pancreatic head: a matched case-control study.

PURPOSE: To compare the postoperative results of various preservative surgery (PS) techniques with those of two types of pancreatoduodenectomy (PD). METHODS: The subjects of this study were 65 patients treated surgically for chronic pancreatitis, or benign or borderline tumors. We defined PS as any of the following: duodenum-preserving pancreatic head resection (DPPHR), uncinatectomy (UC), and cystic tumor enucleation (EN). The two types of PD were Whipple pancreatoduodenectomy (WPD) and pylorus-preserving pancreatoduodenectomy (PPPD). RESULTS: Benign lesions were treated with PD in 41 patients and PS in 24 patients. Whipple pancreatoduodenectomy was performed in 17 patients, PPPD in 24, DPPHR in 20, EN in 3, and UC in 1. The main indication for surgery was chronic pancreatitis (66%). Delayed gastric emptying (DGE) was seen in 41% of patients in the PD group but none in the PS group (P = 0.04). However, there were no differences between the two groups in the incidence of pancreatic fistulas or other complications. Reoperation was required in five of the PD patients, but none of the PS patients. CONCLUSION: Surgical techniques for preserving pancreatic tissue are effective for carefully selected patients with benign pancreatic disorders.

[Surgical treatment of pancreatic adenocarcinoma by cephalic duodenopancreatectomy (Part 1). Post-surgical complications in 204 cases in a reference hospital]. / Tratamiento quirúrgico del adenocarcinoma pancreático mediante duodenopancreatectomía cefálica (Parte 1). Complicaciones postoperatorias en 204 casos en un centro de referencia.

INTRODUCTION: Cephalic duodenopancreatectomy (CDP) is the treatment of choice in cancer of the head of the pancreas. However, it continues to have a high post-surgical morbidity and mortality. The aim of this article is to define variables that influence post-surgical morbidity and mortality after cephalic duodenopancreatectomy due to pancreatic adenocarcinoma (PA) cancer of the head of the pancreas (CHP). MATERIAL AND METHODS: The variables were prospectively collected form patients operated on between 1991 and 2007, in order to investigate the factors of higher morbidity. RESULTS: A total of 204 patients had been intervened due to PA, of whom 57 were older than 70 years. Of these patients, 119 had a CPD, 11 extended lymphadenectomy, 66 with pyloric conservation, and 8 with extension to total pancreatectomy due to involvement of the section margin. Portal or mesenteric vein resection was included in 35 cases. Post-surgical complications were detected in 45% of cases, the most frequent being: slow gastric emptying (20%), surgical wound infection (17%), pancreatic fistula (10%), and serious medical complications (8%). Further surgery was required in 13%, and the over post-surgical mortality was 7%. A patient age greater than 70 years, post-surgical haemoperitoneum, gastroenteric dehiscence, and the presence of medical complications were post-surgical mortality risk factors in the multivariate analysis. Pancreatic fistula was not a factor associated with post-surgical mortality. CONCLUSIONS: Cephalic duodenopancreatectomy is a safe technique but with a considerable morbidity. Patients over 70 years of age must be carefully selected before considering surgery. Serious medical complications must be treated aggressively to avoid an unfavourable progression.

[Surgical treatment of pancreatic adenocarcinoma using cephalic duodenopancreatectomy (Part 2). Long term follow up after 204 cases]. / Tratamiento quirúrgico del adenocarcinoma pancreático mediante duodenopancreatectomía cefálica (parte 2). Seguimiento a largo plazo tras 204 casos.

INTRODUCTION: Surgery is the accepted treatment in adenocarcinoma of the head of the pancreas; however, the long-term survival continues to be low. The aim of this study is to define prognostic factors of long-term survival after cephalic duodenopancreatectomy due to pancreatic adenocarcinoma. MATERIAL AND METHODS: We have collected data on the treatment of adenocarcinoma of the head of the pancreas (ADHP) by means of a cephalic duodenopancreatectomy (CDP) performed n the Bellvitge University Hospital (Barcelona) from 1991 to 2007. RESULTS: A total of 204 CDP due to ADHP were performed. The histology showed that the resected tumour was larger than 3cms in 70 cases, with lymphatic infiltration in 73%, perineural invasion in 89%, and lymphatic involvement in 89%. More than 15 lymph nodes were resected in 120 patients. A total of 113 (60%) patients received adjuvant treatment after surgery. There were 148 (73%) deaths, of which 55 (27%) were alive at closure. The actual mean survival was 2.54 years (95% CI; 2.02-3.07) and an actuarial survival at 5 years of 13.55% (95% CI; 7.69-19.41). The study of mortality risk factors showed that, female gender, absence of peri-operative transfusion (p=0.003), the resection of more than 15 lymph nodes during the operation (P=0.004), and the administration of adjuvant treatment (p=0.004) had a better long-term prognosis. The multivariate analysis showed that transfusion and gender were the most significant variables. CONCLUSIONS: Surgery of head of the pancreas adenocarcinoma must include an adequate lymphadectomy, and must be performed with a low morbidity and without the need of a peri-operative transfusion.

Transcatheter arterial chemoembolization in patients with hepatocellular carcinoma on the waiting list for orthotopic liver transplantation.

OBJECTIVE: The objective of this study was to perform a retrospective analysis of patients with hepatocellular carcinoma (HCC) who underwent transcatheter arterial chemoembolization (TACE) before undergoing liver transplantation at our institution. SUBJECTS AND METHODS: From January 2000 to August 2005, 56 patients with HCC underwent TACE before orthotopic liver transplantation (OLT). Radiologic findings before and after TACE were assessed and correlated with histologic findings after OLT. The area of induced necrosis was pathologically evaluated in each HCC nodule. RESULTS: One hundred thirty-one HCC nodules were detected at histologic study. One hundred seventeen HCC nodules (91.4%) were hyperenhancing in the arterial phase on the preoperative imaging studies. The percentage of tumor necrosis was greater than 90% in 48 nodules (38%), between 50% and 90% in 19 nodules (15%), and less than 50% in 61 nodules (48%); tumor necrosis data were not recorded for the remaining three nodules. The size of the preoperatively detected lesions ranged from 0.2 to 9 cm (mean, 2.58 cm). The mean percentage of tumor necrosis was 67.8% in this group, but it rose to 79.2% in the hypervascular lesions. The size of the nodules that were not detected preoperatively ranged from 0.1 to 1.9 cm (mean, 0.68 cm), and the mean percentage of tumor necrosis was only 1.57%. CONCLUSION: TACE is a safe treatment in well-selected patients. Its antitumoral effect is high in hypervascular lesions (mean necrosis, 79.2%). It provides good local control in preoperatively diagnosed HCC (mean necrosis, 67.8%), but its impact is limited in lesions not detected preoperatively (mean necrosis, 1.57%).

[Cystic neoplasms of the pancreas. Diagnostic and therapeutic management]. / Neoplasias quísticas del páncreas. Manejo diagnóstico y terapéutico.

Management of the cystic lesions of the pancreas is of interest to general and pancreatic surgeons and physicians of other disciplines: gastroenterology, internal medicine, endoscopy, radiology, pathology, etc. The majority of cystic lesions are inflammatory pseudo-cysts. Cystic neoplasms represents only 10% of cystic lesions of the pancreas and 1% of pancreatic tumours. Preoperative diagnosis is crucial given the differences in natural history of the spectrum of benign, malignant, and borderline lesions. Serous cystadenoma is a benign lesion that requires non-surgical management if there are no symptoms. Mucinous neoplasms are premalignant lesions that mainly require pancreatic resection. Despite improved radiographic imaging techniques, definitive diagnosis is only made after studying the resection sample. The pancreatic surgical risk is a problem for the appropriate management of these patients.

Outcomes after neoadjuvant treatment with gemcitabine and erlotinib followed by gemcitabine-erlotinib and radiotherapy for resectable pancreatic cancer (GEMCAD 10-03 trial).

BACKGROUND: Neoadjuvant therapy (NAT) for pancreatic adenocarcinoma (PDAC) patients has shown promising results in non-randomized trials. This is a multi-institutional phase II trial of NAT in resectable PDAC patients. METHODS: Patients with confirmed resectable PDAC after agreement by two expert radiologists were eligible. Patients received three cycles of GEM (1000 mg/m2/week) plus daily erlotinib (ERL) (100 mg/day). After re-staging, patients without progressive disease underwent 5 weeks of therapy with GEM (300 mg/m2/week), ERL 100 mg/day and concomitant radiotherapy (45 Gy). Efficacy was assessed using tumor regression grade (TRG) and resection margin status. Using a single-arm Simon's design, considering the therapy not useful if R0 < 40% and useful if the R0 > 70% (alpha 5%, beta 10%), 24 patients needed to be recruited. This trial was registered at ClinicalTrials.gov, number NCT01389440. RESULTS: Twenty-five patients were enrolled. Adverse effects of NAT were mainly mild gastrointestinal disorders. Resectability rate was 76%, with a R0 rate of 63.1% among the resected patients. Median overall survival (OS) and disease-free survival (DFS) were 23.8 (95% CI 11.4-36.2) and 12.8 months (95% CI 8.6-17.1), respectively. R0 resection patients had better median OS, compared with patients with R1 resection or not resected (65.5 months vs. 15.5 months, p = 0.01). N0 rate among the resected patients was 63.1%, and showed a longer median OS (65.5 vs. 15.2 months, p = 0.009). CONCLUSION: The results of this study confirm promising oncologic results with NAT for patients with resectable PDAC. Therefore, the present trial supports the development of phase II randomized trials comparing NAT vs. upfront surgery in resectable pancreatic cancer.

OncoSurge: a strategy for improving resectability with curative intent in metastatic colorectal cancer.

PURPOSE: Most patients with colorectal liver metastases present to general surgeons and oncologists without a specialist interest in their management. Since treatment strategy is frequently dependent on the response to earlier treatments, our aim was to create a therapeutic decision model identifying appropriate procedure sequences. METHODS: We used the RAND Corporation/University of California, Los Angeles Appropriateness Method (RAM) assessing strategies of resection, local ablation and chemotherapy. After a comprehensive literature review, an expert panel rated appropriateness of each treatment option for a total of 1,872 ratings decisions in 252 cases. A decision model was constructed, consensus measured and results validated using 48 virtual cases, and 34 real cases with known outcomes. RESULTS: Consensus was achieved with overall agreement rates of 93.4 to 99.1%. Absolute resection contraindications included unresectable extrahepatic disease, more than 70% liver involvement, liver failure, and being surgically unfit. Factors not influencing treatment strategy were age, primary tumor stage, timing of metastases detection, past blood transfusion, liver resection type, pre-resection carcinoembryonic antigen (CEA), and previous hepatectomy. Immediate resection was appropriate with adequate radiologically-defined resection margins and no portal adenopathy; other factors included presence of < or = 4 or > 4 metastases and unilobar or bilobar involvement. Resection was appropriate postchemotherapy, independent of tumor response in the case of < or = 4 metastases and unilobar liver involvement. Resection was appropriate only for > 4 metastases or bilobar liver involvement, after tumor shrinkage with chemotherapy. When possible, resection was preferred to local ablation. CONCLUSION: The results were incorporated into a decision matrix, creating a computer program (OncoSurge). This model identifies individual patient resectability, recommending optimal treatment strategies. It may also be used for medical education.

CT in hepatic cirrhosis and chronic hepatitis.

Cirrhosis is a diffuse liver disease with premalignant potential in which hepatocellular carcinoma (HCC) frequently develops. The hemodynamics of contrast material are the key to diagnosis of focal liver lesions with computed tomography (CT). Lesions with arterial-dominant vascularity, such as HCC, show brisk enhancement during the arterial phase, whereas lesions with portal blood supply can appear as hyperenhancing lesions in the portal phase. The advent of helical CT has significantly improved the CT examination of the liver because the arterial phase can be displayed independently of the portal phase. The addition of arterial phase imaging to conventional portal phase imaging seems to improve tumor detection and characterization. Although HCC is the single most frequent tumor seen in chronic liver disease, other lesions such as peripheral cholangiocarcinoma and hemangioma should be considered in the differential diagnosis. Optimization of helical CT techniques may allow better detection and characterization of these lesions. In addition to tumor detection, CT plays an important role in preoperative staging of HCC as well as in preoperative assessment of patient candidates to hepatic transplantation. The use of CT angiography with maximum intensity projection techniques may allow for better preoperative work-up and vascular mapping in HCC patients. This article shows the spectrum of helical CT findings in chronic liver disease and specifically in the imaging of HCC and other focal lesions.

Radiological diagnosis and staging of hilar cholangiocarcinoma.

Hilar cholangiocarcinoma is a rare malignant tumor arising from the epithelium of the bile ducts. Surgery is still the only chance of potentially curative treatment in patients with perihilar cholangiocarcinoma. However, radical resection requires aggressive surgical strategies that should be tailored optimally according to the location, size and vascular invasion of the tumors. Accurate diagnosis and staging of these tumors is therefore critical for optimal treatment planning and for determining a prognosis. Multidetector computed tomography (MDCT), magnetic resonance imaging (MRI) and MR cholangiography are useful tools, both to diagnose and stage hilar cholangiocarcinoma. Modern imaging techniques allow accurate detection of the level of obstruction and the longitudinal and radial spread of the tumor. In addition, high-resolution MDCT and MR provide specific radiographic features to determine vascular involvement of anatomic structures, such as the hepatic artery or the portal vein, which are critical to decide the surgical strategy. Finally, radiological staging allows detection of patients with distant metastasis in the liver or peritoneum who will not benefit from a surgical approach.

Factors influencing mortality in patients undergoing surgery for acute pancreatitis: importance of peripancreatic tissue and fluid infection.

OBJECTIVES: The aims of present study were to analyze the mortality risk factors in patients who had surgery for acute pancreatitis and to assess the importance of culturing peripancreatic tissue or fluid infection to ascertain the infection status. METHODS: Surgery was indicated both in patients with infected severe acute pancreatitis and in those with sterile pancreatitis with an unfavorable course. During surgery, cultures were taken of tissues (pancreatic necrosis and peripancreatic fat), intra-abdominal fluid, and bile. RESULTS: Of 107 patients operated on, fluid culture was analyzed in 94 patients, pancreatic necrosis in 61 patients, peripancreatic fat in 39 patients, and bile in 38 patients. Sterile pancreatitis with sterile ascites was found in 17 patients, sterile pancreatitis with infected ascites in 22, and pancreatic tissue infection in 60. Multivariate analysis demonstrated that sterile tissue cultures, age over 65 years, and fewer than 12 days between the beginning of pain and surgery were risk factors for mortality. Sterile pancreatitis with sterile ascites and sterile pancreatitis with infected ascites had similar postoperative mortality (41% and 50%, respectively); the group with pancreatic tissue infection had a lower mortality (20%). CONCLUSIONS: Early surgery, advanced age, and sterility of tissue cultures have been demonstrated as mortality factors for acute pancreatitis. Intra-abdominal fluid may be infected in the presence of sterile necrosis.

[Bile duct cysts in adults: surgical procedure]. / Quistes de los conductos biliares del adulto: estrategia quirúrgica.

OBJECTIVE: The reported prevalence rate of bile duct cysts is very low. However, the clinical presentation of bile duct cysts is common to other hepatobiliary diseases. In this article, we report on a series of patients who have been surgically treated over the last 15 years. MATERIAL AND METHOD: All the patients who had undergone bile duct cyst-related surgery at this hospital had their clinical history reviewed retrospectively from 1990 to 2002. Data were obtained prospectively from 2002 to 2005. The following variables were taken into account in our analysis: diagnosis data, surgical procedure, morbidity, post-surgery mortality rates, and follow-up. RESULTS: Over the last 15 years, 18 patients have undergone surgery at our hospital (6 male, 12 female). The most common clinical presentation was that of abdominal pain and the usual symptoms associated with acute cholangitis. As for surgical procedure, a complete cyst resection with biliary derivation was performed in all 15 cases. The histopathological diagnosis was choledochal cyst in 12 cases, Caroli's disease in 5 cases and a malignant choledochal cyst (adenocarcinoma) in 1 case. The most frequent post-surgical complication was bile leak (3 cases, 16.6%). There was no post-surgical mortality (0%). There were no relapses in the subsequent follow-up CONCLUSIONS: Our preferred surgical procedure is that of complete cyst resection with biliary derivation. Our overall results are similar to those of medical teams who practise a radical resective procedure, and better than those who practise partial resections.

Surgical resection of colorectal liver metastases in patients with expanded indications: a single-center experience with 501 patients.

PURPOSE: This study was designed to investigate survival after curative resection of colorectal liver metastases in patients with expanded indications. METHODS: A total of 501 patients had 545 liver resections for metastatic colorectal cancer. There were no predefined criteria for resectability with regard to the number or size of the tumors, locoregional invasion, or extrahepatic disease, except that resection had potential to be complete and macroscopically curative. All patients who had curative hepatic resection were advised to start postoperative adjuvant chemotherapy. RESULTS: A total of 259 patients had expanded indications (52 percent), including 14 with liver metastases >10 cm, 194 with bilateral deposits, 140 with four or more liver metastases, and 73 with extrahepatic disease. The overall actuarial survival rates at one, three, five, and ten years were 88, 67, 45, and 36 percent, respectively, for patients with classic indications and 84, 53, 34, and 24 percent, respectively, for patients with expanded indications (P = 0.0009). In the group of expanded indications, there were more patients who received preoperative than postoperative chemotherapy: 72 (28 percent) vs. 18 (7 percent; P < 0.0001), and 148 (70 percent) vs. 131 (61 percent; P = 0.0466). In a multivariate analysis, four or more liver metastases and extrahepatic disease were independent predictors of poor outcome. Adjuvant chemotherapy significantly improved survival (P = 0.0002). CONCLUSIONS: This study suggested that liver resection should be indicated in patients with expanded indications. The extent of the benefits of preoperative and postoperative chemotherapy needs to be quantitated.

[Indications and results of pancreatic surgery preserving the duodenopancreatic region]. / Indicaciones y resultados de la cirugía conservadora en las lesiones localizadas en la cabeza pancreática.

INTRODUCTION: Surgery that preserves the duodenopancreatic region has become well-established in chronic pancreatitis (CP) and some groups have begun to use these techniques to treat benign tumors and even those with uncertain potential malignancy. However, the technical complexity of this type of intervention may be greater than that of cephalic duodenopancreatectomy and complications may be even more frequent and consequently the indications for these procedures are debated. The aim of this study was to evaluate the experience accumulated at our center over the past few years in the use of pancreatic surgery preserving the duodenopancreatic region (PS). MATERIAL AND METHODS. Between 1996 and 2006, we carried out PS in 24 patients with disease localized in the head of the pancreas. PS was defined as any of the following techniques: resection of the head of the pancreas with duodenal preservation (RHPDP), uncinatectomy (UC) and cystic tumor enucleation (EN). RESULTS: RHPDP was performed in 20 patients (83%), UC in 1 (4%) and EN in 3 (13%). Surgery was performed for CP in 11 patients, serous cystoadenoma in 4, intraductal papillary mucinous tumor in 5 and miscellaneous injuries in the four remaining patients. Overall, the series showed 54% morbidity with no post-operative mortality. The median length of postoperative hospital stay was 11 days (7-43). CONCLUSION: After analyzing the experience accumulated over the years, showing nil mortality and acceptable morbidity, we believe that the use of these 3 techniques for preserving the pancreatic parenchyma is useful when their suitability is rigorously indicated. Subsequent studies should look in depth at improving quality of life and physiological effects, depending on the technique used.

Fat in the liver: diagnosis and characterization.

The purpose of this article is to provide an update on imaging techniques useful for detection and characterization of fat in the liver. Imaging findings of liver steatosis, both diffuse steatosis and focal fatty change, as well as focal fatty sparing, are presented. In addition, we will review computed tomography (CT) and magnetic resonance (MR) findings of focal liver lesions with fatty metamorphosis, including hepatocellular carcinoma, hepatocellular adenoma, focal nodular hyperplasia, angiomyolipoma, lipoma, and metastases.

Biliary complications after liver transplantation: diagnosis with MR cholangiopancreatography.

OBJECTIVE: We sought to evaluate MR cholangiopancreatography (MRCP) as the only imaging procedure used in the diagnosis and management of biliary complications after orthotopic liver transplantation (OLT). CONCLUSION: MRCP is a useful imaging procedure in the assessment of biliary complications after OLT.

Selective use of low-osmolality contrast media in computed tomography.

The aim of this study was to describe our experience and institutional savings with a selective use of low-osmolality contrast media (LOCM) in CT. From 1995 to 1998, a total of 19,834 contrast-enhanced CT examinations were performed at our institution. Contrast was injected with a power injector and large venous catheter, 20-G for 2- to 3-ml rate and 18-G for 3- to 5-ml rate. High-osmolality contrast media was used in 13,670 patients (71%). The LOCM was used in 5884 (29%) patients. Our guidelines for the use of LOCM included cardiac dysfunction, severe pulmonary impairment, history of allergy or prior moderate reaction to HOCM and severe debilitation. Prior to the injection of HOCM, 10 mg of metoclopramide (Primperan, Delagrange Quétigny, France) were administered to reduce nausea and vomiting. In the HOCM group there were 304 minor or mild adverse reactions (2.2%), and 10 severe adverse reactions (0.08%). In the LOCM there were 34 mild or moderate adverse reactions (0.59%) and 3 severe adverse reactions (0.05%). Significant differences in terms of mild adverse reactions were found between HOCM and LOCM (Fischer's test, p<0.001). No significant differences were found in terms of severe adverse reactions ( p=0.27). After subtracting the cost of treating additional adverse reactions, the net differential cost between universal and selective use of LOCM was 565,285 Euro (601,067 US dollars). This means a net increase of 41.4 Euro per patient or 414,000 Euro per 10,000 patients (438,840 US dollars). Selective use of LOCM in CT is safe and effective and results in a substantial reduction in costs.