Synthesis and electronic properties of polycyclic aromatic hydrocarbons doped with phosphorus and sulfur.

In this work, we report on the synthesis of polyaromatic hydrocarbons containing phosphole and thiophene rings at the edge. The ring-closure reactions have been investigated by theoretical calculations. The optical and electrochemical properties and density functional theory calculations showed that the properties depend on the relative position of these five membered rings in the PAH structure.

Solid-phase extraction based on hydrophilic interaction liquid chromatography with acetone as eluent for eliminating matrix effects in the analysis of biological fluids by LC-MS.

Analysis of drugs and metabolites in biological matrices such as blood or plasma by LC-MS is routinely challenged by the presence of large quantities of competing molecules for ionization in soft ionization sources, such as proteins and phospholipids. While the former can easily be removed by protein precipitation, pre-analytical extraction of the latter is necessary because they show very high retention in reversed-phase LC resulting in long analysis times or in ion suppression effects when not eluted before the next runs. A novel HILIC-based SPE approach, making use of silica cartridges and of acetone as organic solvent, is introduced as a potent alternative to current commercial methods for phospholipid removal. The methodology was developed and tested for a broad polarity range of pharmaceutical solutes (log P from 0 to 6.6) and broad applicability can therefore be envisaged.

High failure rate after laparoscopic adjustable silicone gastric banding for treatment of morbid obesity.

OBJECTIVE: To report the results from one of the eight original U.S. centers performing laparoscopic adjustable silicone gastric banding (LASGB), a new minimally invasive surgical technique for treatment of morbid obesity. SUMMARY BACKGROUND DATA: Laparoscopic adjustable silicone gastric banding is under evaluation by the Food & Drug Administration in the United States in an initial cohort of 300 patients. METHODS: Of 37 patients undergoing laparoscopic placement of the LASGB device, successful placement occurred in 36 from March 1996 to May 1998. Patients have been followed up for up to 4 years. RESULTS: Five patients (14%) have been lost to follow-up for more than 2 years but at last available follow-up (3-18 months after surgery) had achieved only 18% (range 5-38%) excess weight loss. African American patients had poor weight loss after LASGB compared with whites. The LASGB devices were removed in 15 (41%) patients 10 days to 42 months after surgery. Four patients underwent simple removal; 11 were converted to gastric bypass. The most common reason for removal was inadequate weight loss in the presence of a functioning band. The primary reasons for removal in others were infection, leakage from the inflatable silicone ring causing inadequate weight loss, or band slippage. The patients with band slippage had concomitant poor weight loss. Bands were removed in two others as a result of symptoms related to esophageal dilatation. In 18 of 25 patients (71%) who underwent preoperative and long-term postoperative contrast evaluation, a significantly increased esophageal diameter developed; of these, 13 (72%) had prominent dysphagia, vomiting, or reflux symptoms. Of the remaining 21 patients with bands, 8 currently desire removal and conversion to gastric bypass for inadequate weight loss. Six of the remaining patients have persistent morbid obesity at least 2 years after surgery but refuse to undergo further surgery or claim to be satisfied with the results. Overall, only four patients achieved a body-mass index of less than 35 and/or at least a 50% reduction in excess weight. Thus, the overall need for band removal and conversion to GBP in this series will ultimately exceed 50%. CONCLUSIONS: The authors did not find LASGB to be an effective procedure for the surgical treatment of morbid obesity. Complications after LASGB include esophageal dilatation, band leakage, infection, erosion, and slippage. Inadequate weight loss is common, particularly in African American patients. More study is required to determine the long-term efficacy of the LASGB

Right lobe living donor liver transplantation: preoperative evaluation of the donor with MR imaging.

OBJECTIVE: The purpose of this study was to report our experience in preoperative evaluation of right hepatic lobe donors with a comprehensive MR examination and to compare abdominal MR images, MR cholangiograms, and MR angiograms with findings at surgery, intraoperative cholangiography, and digital subtraction angiography. MATERIALS AND METHODS: Twenty-eight right hepatic lobe donors underwent preoperative evaluation with MR imaging, MR cholangiography, and MR angiography. Two abdominal radiologists independently and randomly reviewed these studies. Points of assessment included focal and diffuse liver disease, calculation of right lobe volumes, depiction of the biliary tract and ductal anomalies, and depiction of the liver vasculature and vascular anomalies. Comparison was made with intraoperative cholangiograms (n = 20) and digital subtraction angiograms (n = 28). RESULTS: MR imaging revealed and characterized focal liver lesions in eight of 28 patients. Calculated right lobe volumes agreed with surgically determined volumes within 7% for reviewer 1 and within 15% for reviewer 2. Intrahepatic bile ducts were depicted completely with MR cholangiography in 25 of 28 patients and with intraoperative cholangiography in nine of 20 patients. MR cholangiography revealed ductal anomalies in six patients. MR imaging and MR angiography depicted the portal veins more completely than digital subtraction angiography. MR imaging and MR angiography correctly excluded portal venous anomalies in all patients and revealed surgically confirmed accessory hepatic veins in six of 28 patients. Angiographically confirmed arterial anomalies were correctly detected in three of 28 patients by at least one reviewer on MR imaging and MR angiography. CONCLUSION: MR imaging, MR cholangiography, and MR angiography provide a comprehensive, accurate means of evaluating donors for factors that may preclude or complicate right hepatic lobe donation.

Use of imaging for living donor liver transplantation.

Living donor liver transplantation is emerging as an alternative to cadaveric liver transplantation. The authors present multimodality images obtained in 44 cases of living donor liver transplantation. The images in this article were derived from the pre-, intra-, and postoperative imaging protocol for their institutional transplantation program. Preoperative magnetic resonance (MR) imaging in the donor allows detection of focal liver lesions and accurate determination of liver volume. The latter is crucial to ensure adequate postoperative liver function for donors and recipients. MR cholangiography depicts donor biliary anatomy. MR angiography and digital subtraction arteriography are performed to assess vascular anatomy. Intraoperative ultrasonography (US) helps determine the resection plane during donor hepatectomy. Postoperative MR imaging documents liver regrowth. MR imaging, US, and computed tomography help assess complications in donors and recipients.

No chromosomal instability in offspring of survivors of childhood malignancy.

Chromosomal instability was examined in 20 apparently healthy children of survivors of childhood malignancy. As compared to controls, no increase of spontaneous or bleomycin-induced aberrations (including gaps, breaks, sister chromatid exchanges, pulverization, and premature centromere divisions) were found in these "index children." The results suggest that the offspring of subjects previously receiving chemotherapy and/or radiotherapy for childhood malignancy are probably at no increased risk of latent chromosomal instability.

Assessment of resident knowledge: subjective assessment versus performance on the ACR in-training examination.

RATIONALE AND OBJECTIVES: The authors assessed the ability of faculty and residents to predict the ranked performance of residents on the American College of Radiology (ACR) In-Training Examination. MATERIALS AND METHODS: Radiology faculty at Penn State Geisinger Health System (PSGHS), the Medical College of Virginia (MCV), and the University of Virginia (UVA) and residents at PSGHS and MCV ranked the expected performances of residents taking the 1997 ACR In-Training Examination. Surveyed faculty and residents were blinded to the actual performances on the examination. Forty-nine residents took the examination (21 at PSGHS, 22 at MCV, six at UVA), and 37 faculty members (11 at PSGHS, 11 at MCV, 15 at UVA) participated in the study. Correlation analysis was performed to assess the agreement between the subjective and actual ranking of residents in each residency class. RESULTS: Faculty were moderately accurate in the overall ranking of resident performances (r = 0.34). High levels of concordance for ranking individual residents correlated with accuracy in only certain cases. Differences in agreement and accuracy of the respondents existed between PSGHS and MCV (P = .0001 and .0014, respectively). The concordance of respondents increased significantly from the 1st- to the 2nd-year class at MCV (P = .0002), whereas accuracy increased significantly between these classes for the PSGHS (P = .042). CONCLUSION: Faculty are only moderately successful in ranking resident performances on the ACR In-Training Examination, and a high level of agreement is not necessarily indicative of increased accuracy. The concordance and accuracy of subjective rankings differ among residency programs and classes.

Adjustable laparoscopic gastric band for the treatment of morbid obesity: radiologic evaluation.

OBJECTIVE: This article describes the radiographic appearance of a recently developed laparoscopically placed adjustable gastric band for the treatment of morbid obesity. The optimal technique for contrast evaluation of the device, complications associated with its use, and the technique for stoma adjustments are also discussed. SUBJECTS AND METHODS: Between May and December 1996, 23 patients at our institution underwent laparoscopic placement of adjustable silicone gastric bands for treatment of morbid obesity. All patients underwent a barium upper gastrointestinal series before surgery, 1 day after band placement, at variable intervals when each patient returned for band adjustment, and at 1 year. RESULTS: Unlike the case in other gastric weight loss procedures, the optimal patient position for contrast evaluation of gastric bands was anteroposterior or slightly right posterior oblique. Twenty-one of 23 patients had no complications shown on the postoperative upper gastrointestinal series. Stoma size was approximately 3-8 mm, and most patients showed delayed esophageal emptying without obstruction. Two patients had herniation of the stomach through the gastric band with pouch enlargement, resulting in obstruction and the need for additional surgery. We saw no leaks or band erosions. Nineteen stoma adjustments were performed in 13 patients. One patient had an inverted port that could not be accessed for adjustment. CONCLUSION: As adjustable gastric bands become more widely used, radiologists need to be familiar with the radiographic appearance of the devices, the complications associated with their use, and the optimal patient positioning for contrast evaluation. Radiologists may also be involved with band adjustment to decrease or increase the stoma size and therefore need to understand the technique and potential difficulties of adjusting the stoma.

Leiomyomatosis peritonealis disseminata complicated by sarcomatous transformation and ovarian torsion: presentation of two cases and review of the literature.

Leiomyomatosis peritonealis disseminata (LPD) is a rare disorder usually discovered incidentally in women of child-bearing age and is characterized by multiple subperitoneal smooth muscle nodules. Case reports of two patients with complications related to LPD and a review of the literature are presented. In one case, the patient carried the diagnosis of LPD for 11 years and experienced sarcomatous transformation; this is the first report of the magnetic resonance appearance of this entity. In the second case, LPD was diagnosed after an LPD implant on the ovary-induced ovarian torsion. We also present a patient in whom large, pedunculated uterine leiomyomas mimicked LPD. The clinical presentation, possible pathogenesis, imaging features, and therapeutic options of LPD are reviewed. Because this uncommon condition is being reported with increasing frequency, familiarity with its imaging features and pitfalls is important to suggest the diagnosis in the appropriate clinical setting.

[Study of offsprings of survivors of childhood malignant diseases]. / Gyermekkori malignus betegségböl gyógyultak utódainak vizsgálata.

Anthropometric, dysmorphologic, and cytogenetic investigations of 21 children of 20 survivors of childhood malignancy revealed no signs of congenital anomalies in any of the subjects examined. No increase of mild errors of morphogenesis (minor anomalies) was observed in the well-developing children; no latent chromosome instability was found in their Bleomycin-treated lymphocyte cultures either. The suggestion that previous oncological therapy does not lead to an increased risk of congenital disorders in the offspring was confirmed by the present findings obtained with various, in part new methods.

Imaging features of radiation-induced changes in the abdomen.

After external-beam radiation therapy, radiation-induced changes may be observed in abdominal and pelvic organs at imaging. In the liver, an area of low attenuation corresponding to the radiation port (or an area of hyperattenuation if the underlying liver tissue shows fatty change) can be seen at computed tomography (CT) performed within 3-6 months after therapy. Later, the liver may be fibrotic and contracted. In the stomach, small intestine, and colon, wall thickening and edema are early manifestations. Ulcers may also be observed. Long-term complications include strictures and fistulas. After irradiation of the kidneys, altered attenuation of the renal parenchyma may be seen at CT. Ureteral strictures, typically involving the distal ureter, may be observed after pelvic irradiation. The bladder may be small and contracted with a thickened wall after radiation exposure. Fistulas between the bladder and other pelvic organs sometimes occur. Typical musculoskeletal changes include growth abnormalities in skeletally immature patients, fatty replacement of bone marrow, and radiation osteitis. Radiation-induced neoplasms are also recognized after therapy.

Gastrointestinal tract involvement by gynecologic diseases.

Involvement of the gastrointestinal tract by gynecologic disease processes-endometriosis, gynecologic neoplasms, inflammatory processes, and complications from radiation therapy or surgery for gynecologic tumors-may mimic primary gastrointestinal carcinoma on radiologic images. Endometriosis most often involves the anterior wall of the rectosigmoid colon, adjacent to the pouch of Douglas, and typically produces extrinsic mass effect on the serosa, with the overlying mucosa left intact. Direct extension of ovarian cancer to the colon through the subperitoneal space produces mass effect with serosal spiculation, tethering, and fixation; annular constriction; or partial or complete obstruction. Intraperitoneal seeding of ovarian carcinoma most frequently involves the colon and is seen as extrinsic masses, often with serosal spiculation and tethering. Cervical carcinoma, which most commonly spreads by direct invasion of the pelvic side wall and adjacent structures, produces serosal spiculation and circumferential narrowing. Benign ovarian or uterine tumors are purely extrinsic and have a smooth interface with the colonic wall. Tubo-ovarian abscesses are difficult to differentiate from cystic ovarian neoplasms or endometriomas. Radiation colitis causes narrowing of the rectum with intact mucosa and can be differentiated from recurrent tumor, unlike radiation-induced injury of the small bowel, which may be difficult to distinguish. Surgical adhesions produce a discrete transition point between dilated bowel proximally and nondilated distal bowel. Familiarity with the varied patterns of gastrointestinal tract involvement is important for accurate interpretation of imaging studies.

Congenital abnormalities of the pancreas and biliary tree in adults.

Congenital abnormalities of the pancreaticobiliary tree may go undetected until adulthood. In adult patients with persistent and unexplained signs and symptoms, such as cholangitis, pancreatitis, jaundice, recurrent abdominal pain, and nausea and vomiting, a congenital anomaly of the pancreatic or bile duct must be considered and a low threshold for performing cholangiopancreatography is recommended. The most common congenital pancreaticobiliary abnormalities seen in adults are choledochal cyst, anomalous junction of the pancreatic and common bile ducts, aberrant biliary ducts, and pancreas divisum, with the following entities being more rarely seen: choledochoceles, multiple communicating intra- and extrahepatic duct cysts, Caroli disease, pancreaticobiliary abnormalities associated with situs anomalies, annular pancreas, and aberrant pancreatic ducts associated with enteric duplication cysts. Cholangiopancreatography allows confirmation of diagnosis and may demonstrate associated abnormalities such as choledocholithiasis or tumor. Recognition of congenital anomalies may aid in surgical planning and prevent inadvertent ductal injury. Although congenital pancreaticobiliary abnormalities are relatively uncommon, the increased prevalence of cholangitis, gallstones, and cholangiocarcinoma seen with the various types of biliary cystic disease and junctional anomalies and the increased association of pancreatitis seen with pancreatic anomalies make recognition of variant anatomy clinically important.

Primary endodermal sinus tumor of the liver detected by CT.

We report a case of primary endodermal sinus tumor of the liver. Endodermal sinus tumors are rare neoplasms which usually arise in the testis or ovary. Extragonadal endodermal sinus tumors are uncommon and primary tumors of the liver are very rare. The tumor was detected using CT and the diagnosis was made by percutaneous biopsy.

Magnetic resonance imaging of cardiac rhabdomyosarcoma. Quantifying the response to chemotherapy.

This report illustrates the use of cardiac magnetic resonance imaging (MRI) to quantify the initial extent of a cardiac rhabdomyosarcoma and, more importantly, its response to chemotherapy. Image slices spanning the heart and adjacent structures were analyzed using Simpson's rule applied to the image slices to estimate the tumor volume initially, then after 5 weeks, and again after 4 months of chemotherapy. A substantial, progressive reduction in tumor volume during chemotherapy was shown. After chemotherapy was discontinued, an increase in tumor volume was shown. It is suggested that, in addition to being useful in patient care, the technique may be useful in clinical investigations by providing an objective, quantitative measure of tumor response to therapy.

Laryngospasm-induced pulmonary edema.

Pulmonary edema after relief of airway obstruction due to laryngospasm is an uncommon but recognized entity. The authors report a case of a previously healthy young man who developed pulmonary edema after relief of laryngospasm following extubation of the trachea. Pulmonary edema after relief of acute airway obstruction should be included in the differential diagnosis of noncardiogenic pulmonary edema in the appropriate clinical setting.