Imaging-based prostate cancer screening among BRCA mutation carriers-results from the first round of screening.

BACKGROUND: Male-carriers of BRCA1/2 gene mutations have an increased risk of prostate cancer (PCa) with a more aggressive phenotype. Current screening-guidelines suggest the use of prostate-specific antigen (PSA) only among BRCA2 carriers. Female carriers have extensive guidelines that include imaging. Our objective was to test the prevalence of PCa among BRCA carriers and examine screening strategies, using PSA and multiparametric magnetic resonance imaging (mpMRI). PATIENTS AND METHODS: We recruited men aged 40-70 years with BRCA1/2 germline mutations and no prior history of prostate biopsy. All men underwent an initial round of screening which included PSA, and prostate mpMRI. PSA was considered elevated using an age-stratified threshold of ≥1 ng/ml for 40-50 years of age, ≥2 ng/ml for 50-60 years of age, and 2.5 ng/ml for 60-70 years of age. Men with elevated PSA and/or suspicious lesion on mpMRI were offered a prostate biopsy. PSA levels, MRI findings, PCa incidence, and tumor characteristics were evaluated. Decision curve analysis was used to compare screening strategies. RESULTS: We recruited 188 men (108 BRCA1, 80 BRCA2), mean age 54 years (9.8). One hundred and ten (57%) had either elevated age-stratified PSA (75; 40%), a suspicious MRI lesion (67; 36%), or both (32; 17%). Of these, 92 (85%) agreed to perform a prostate biopsy. Sixteen (8.5%) were diagnosed with PCa; 44% of the tumors were classified as intermediate- or high-risk disease. mpMRI-based screening missed only one of the cancers (6%), while age-stratified PSA would have missed five (31%). Decision curve analysis showed that mpMRI screening, regardless of PSA, had the highest net benefit for PCa diagnosis, especially among men younger than 55 years of age. We found no difference in the risk of PCa between BRCA1 and BRCA2 (8.3% versus 8.7%, P = 0.91). Ninety percent had a Jewish founder mutation, thus the results cannot be generalized to all ethnic groups. CONCLUSIONS: PCa is prevalent among BRCA carriers. Age may affect screening strategy for PCa in this population. Young carriers could benefit from initial MRI screening. BRCA carriers aged older than 55 years should use PSA and be referred to mpMRI if elevated. TRIAL REGISTRATION: ClinicalTrial.gov ID: NCT02053805.

Abdominal actinomycosis masquerading as colon cancer in a liver transplant recipient.

Infections in transplant recipients are associated with high morbidity and mortality, making their early recognition and treatment particularly important. Abdominal actinomycosis is a rare clinical entity and difficult to diagnose because of its various and nonspecific features. We describe a 57-year-old patient who presented with abdominal actinomycosis simulating colon cancer 6 years after liver transplantation. The main symptom was abdominal pain. Abdominal computed tomography and colonoscopy revealed an intraluminal 4.5 cm mass in the right colon, raising suspicions of a colonic malignancy and leading to surgical intervention. The postoperative pathologic study showed sulfur granules in the resected specimen compatible with abdominal actinomycosis. No signs of recurrence were seen throughout the 6-month follow-up. The literature on actinomycosis infections in immune-compromised hosts is reviewed. This presentation of actinomycosis in a liver transplant recipient has not been described previously, to our knowledge.

Magnetic resonance cholangiopancreatography for the accurate diagnosis of biliary complications after liver transplantation: comparison with endoscopic retrograde cholangiography and percutaneous transhepatic cholangiography - long-term follow-up.

Biliary complications after liver transplantation remain a serious cause of morbidity and mortality. Direct invasive cholangiographic techniques, endoscopic retrograde cholangiography (ERCP) or percutaneous transhepatic cholangiography (PTC), have procedure-related complications. Magnetic resonance cholangiopancreatography (MRCP) is non-invasive, safe, and accurate. The aim of this study was to evaluate MRCP in detecting biliary complications following liver transplantation and comparing findings with ERCP and PTC. Twenty-seven consecutive liver transplant recipients who presented with clinical and biochemical, ultrasonographic, or histological evidence of biliary complications were evaluated with MRCP. Patients were followed up for a median period of 36 months. The presence of a biliary complication was confirmed in 18 patients (66.6%): anastomotic biliary stricture in 12 (66.6%); diffuse intrahepatic biliary stricture in 5 (27.7%): ischemic (n = 3), recurrence of primary sclerosing cholangitis (n = 2), and choledocholithiasis in one. In nine patients (33.3%), MRCP was normal. Six patients underwent ERCP, and eight PTC. There was a statistically significant correlation between the MRCP and both ERCP and PTC (p = 0.01) findings. The sensitivity and specificity of the MRCP were 94.4% and 88.9%, respectively, and the positive and negative predictive values, 94.4% and 89.9%, respectively. MRCP is an accurate imaging tool for the assessment of biliary complications after liver transplantation. We recommend that MRCP be the diagnostic imaging modality of choice in this setting, reserving direct cholangiography for therapeutic procedures.

Factors associated with radiation exposure in patients with inflammatory bowel disease.

BACKGROUND: Inflammatory bowel disease (IBD) patients undergo multiple radiological evaluations. AIM: To estimate total and abdominal radiation exposure from diagnostic X-ray investigations in IBD patients and the associated risk factors. METHODS: Patients with Crohn's disease (CD) or ulcerative colitis (UC) treated in the IBD clinic were recruited. Clinical data were extracted from patient files and radiological data were obtained from the central HMO computer data base. RESULTS: A total of 199 CD and 125 UC patients were included. The mean cumulative estimated doses (CED) for CD and UC were 21.1 19.5 and 15.1 20.4 millisieverts (mSv) respectively (P < 0.001). Twenty-three patients (7.1%) had an estimated CED of > or =50 mSv. In multivariate analyses, predictors of increased CED were: surgery (OR 5.68, 95% CI: 2.73-11.8, P < 0.001), CD (OR 2.56, 95% CI: 1.29-5.07, P = 0.007), prednisone use (OR 2.0, 95% CI: 1.11-3.67, P = 0.02), first year of disease (OR 6.4, 95% CI: 1.3-32, P = 0.02) and age in the upper quartile(OR 3.26, 95% CI: 1.68-6.3, P = 0.001). CONCLUSIONS: Diagnosis of CD, IBD-related surgery, prednisone use, first year of diagnosis and age on the upper quartile are independent predictors of increased exposure in IBD patients. Alternative investigations which do not require radiation exposure should be considered for patients at risk for increased radiation exposure.

A pictorial review of hypovolaemic shock in adults.

Hypovolaemic shock is an infrequently encountered entity found on CT of victims of severe trauma. Early abdominal and pelvic CT can show diffuse abnormalities owing to hypovolaemia that may alert radiologists to the presence of hypovolaemic shock. In this pictorial review, we present the imaging findings of hypovolaemic shock, as seen on CT of the abdomen. A spectrum of vascular and visceral CT signs is described. Vascular signs include diminished inferior vena cava diameter, diminished aortic diameter and abnormal vascular enhancement. Hollow visceral abnormalities include diffuse increased mucosal enhancement of both the small and large bowel, diffuse thickening of the small bowel wall, and small bowel dilatation. Solid visceral abnormalities include both decreased and increased end organ enhancement. This report should increase radiologists' awareness of the CT manifestations of hypovolaemic shock.

The effect of a low-carbohydrate diet on the nonalcoholic fatty liver in morbidly obese patients before bariatric surgery.

BACKGROUND: Bariatric surgery may be complicated by enlargement of the liver, especially of the left lobe, caused by nonalcoholic fatty liver disease often present with morbid obesity. METHODS: The effect of a very low carbohydrate diet for 4 weeks before surgery on liver density and volume was assessed in 14 candidates for bariatric surgery. Computed tomography (CT) scans were performed before and at termination of the diet period. RESULTS: The CT scans clearly showed a significant increase in mean liver density (p = 0.06) and a decrease in mean liver volume (p = 0.01). The increased mean density of the left lobe was markedly greater than that of the right lobe. CONCLUSIONS: The findings show that 4 weeks of a very low carbohydrate diet reduces liver fat content and liver size, particularly of the left lobe. This approach may render bariatric surgery or any foregut operations less difficult in morbidly obese patients and may be a useful treatment for nonalcoholic fatty liver disease.

The halo sign and peripancreatic fluid: useful CT signs of hypovolaemic shock complex in adults.

AIM: To report two new, useful computed tomography (CT) signs of the hypovolaemic shock complex (HSC) in adults admitted after blunt abdominal trauma: the halo sign (ring of fluid around a collapsed intra-hepatic inferior vena cava (IVC)), and peripancreatic retroperitoneal fluid. MATERIALS AND METHODS: CT images of 498 consecutive patients admitted after blunt abdominal trauma were reviewed, of which 27 had CT signs of the HSC. The CT images of these 27 patients were analysed. A control group of 101 patients examined using CT for suspected blunt abdominal trauma who did not have the HSC were chosen for comparison. RESULTS: The most common features involved the vascular compartment: diminished IVC diameter n = 27 a positive halo sign n = 21 diminished anteroposterior diameter of the aorta n = 13 and abnormal vascular enhancement n = 10. Peripancreatic retroperitoneal fluid in the absence of pancreatic injury, pancreatitis or pancreatic disease was observed in eight patients. Hollow visceral abnormalities included: diffuse increased mucosal enhancement of both the small and large bowel n = 19 diffuse thickening of the small bowel wall n =11 and small bowel dilatation n = 7. Solid visceral abnormalities included both decreased and or increased enhancement. Several concomitant intra- and extra-abdominal injuries were also identified. CONCLUSION: In the setting of blunt abdominal trauma, early abdominal CT can show diffuse abnormalities due to the HSC, which occasionally may alert clinicians of unsuspected shock. Recognition of these signs as distinguished from injured viscera is important in order to avoid unnecessary laparotomy. Two new signs are described: the halo sign and peripancreatic retroperitoneal fluid.

Pentoxifylline does not protect against hyperoxic lung injury in rats.

Hyperoxia has been used extensively as a model of acute lung injury. The drug pentoxifylline has been shown to have a protective effect in other models of lung injury. We sought to determine whether pentoxifylline protects against hyperoxic lung injury in rats by decreasing the accumulation of neutrophils within the lung. A total of 84 rats were studied. Twenty four rats were randomized into four groups. Two groups of rats were pretreated for 48 h with either pentoxifylline (20 mg.kg-1) or saline, and then exposed to > 95% O2 for 60 h while treatments continued. Two groups of control rats received the same treatment regimens as the O2-exposed animals, but breathed room air. Neutrophil accumulation in the lung was quantified both by histology and myeloperoxidase activity. Lung neutrophil accumulation increased in the oxygen-exposed group receiving pentoxifylline as compared to oxygen- or air-exposed rats receiving saline injections. Total glutathione was higher in lung homogenates from the hyperoxic, pentoxifylline-treated group than in homogenates from the other three groups. To study survival, 60 rats were exposed to > 95% O2 for 120 h, 30 rats were pretreated with pentoxifylline, and 30 received saline. Survival after 120 h of exposure to hyperoxia was not altered by pentoxifylline treatment (pentoxifylline treated: 6 out of 30 survived; saline treated: 2 out of 30 survived). We conclude that pentoxifylline does not reduce mortality or lung injury in rats exposed to hyperoxia and is associated with an increase in lung neutrophil accumulation.

N-acetylcysteine delays the infiltration of inflammatory cells into the lungs of paraquat-intoxicated rats.

We investigated a possible role for N-acetylcysteine (NAC), a well-known antioxidant and free radical scavenger, against oxidative lung damage as observed in the in vivo model of paraquat-intoxicated rats. The administration of two ip doses of 50 mg/kg NAC to paraquat-intoxicated animals did not change the glutathione status of the lungs, as determined by the measurement of nonprotein sulfhydryl (NP-SH) groups. The administration of NAC did however suppress the paraquat-induced release of chemoattractants for neutrophils in the bronchoalveolar fluid when the lavage was carried out 12 hr after the administration of 30 mg/kg paraquat. Also, in the intoxicated NAC-treated animals, the infiltration of inflammatory cells was significantly reduced, as demonstrated by the examination of the cell composition of the bronchoalveolar lavage (BAL), 24 hr after paraquat. Phorbol myristate acetate-stimulated superoxide anion production from the AM isolated from the BAL of paraquat-intoxicated nontreated animals was lower than that of controls, whereas in the NAC-treated animals, it was close to that of the controls. The obtained results indicate that NAC has a protective effect against oxidative lung damage by delaying inflammation. It also prevents the paraquat-induced reduction of superoxide anion production by stimulated AM. In the present model, however, the NAC administration regimen did not affect the survival rate of paraquat-intoxicated rats.

Parathion transfer and acetylcholinesterase activity in an in-vitro perfused term human placenta.

Organophosphate transport through the placenta was investigated in an in-vitro placental perfusion system. The system consisted of maternal and fetal reservoirs in which Krebs Ringer bicarbonate buffer with heparin, albumin and glucose was circulated at a constant pH, temperature and pO2. Parathion was analysed by means of gas chromatography with a N-P detector. 14C Antipyrine, a lipid soluble salt, was used as an internal standard, which allowed for the difference in placental size and permeability. A certain amount of parathion passed the placenta and reached the fetal compartment. Glucose consumption was not influenced by the introduction of parathion; neither was the water content of the placental tissue. Acetylcholinesterase activity in placental tissue decreased 50%. The amount of parathion transferred was not negligible and could have caused damage to a fetus.