Three-year experience of a dedicated prostate mpMRI pre-biopsy programme and effect on timed cancer diagnostic pathways.

AIM: To evaluate the effect of pre-biopsy magnetic resonance imaging (MRI) on cancer diagnostic times, and to report MRI-directed pathology outcomes. MATERIALS AND METHODS: In total, 1483 patients were referred with prostate cancer suspicion during a 30-month period. Upfront MRI was performed in 745 patients: 332 MRIs in the 15 months prior to dedicated scanning slots (group 1), and 413 in the 15 months post-introduction (group 2). A further 88 patients had initial MRI following clinical assessment. Biopsy via the transrectal (TR) or transperineal (TP) approach was performed, with MRI/ultrasound fusion for MRI targets. Clinically significant cancer (csPCa) was defined as Gleason ≥3+4. Negative MRIs were defined as Likert 1-2. Per-case clinical decisions were taken to biopsy or not. RESULTS: 44.4% of patients avoided biopsy. 484/833 (58.1%) MRIs were negative; 37.4% of these patients had biopsy with a negative predictive value (NPV) of 92.8% for Gleason ≥3+4 and 98.3% for ≥4+3. Overall prostate cancer prevalence was 34.3% (24.6% csPCa). In 323 MRI-positive cases, any cancer was present in 78.9% (csPCa 60.4%). Of the 1483 patients, 1232 (83.1%) completed all diagnostic tests within 28 days. Upfront MRI patients met this standard in 621/833 (74.5%), improving from 66.9% to 81.1% with reserved slots (group 2) with a reduced diagnostic time from median 25.5 to 20.9 days. Biopsy scheduling delayed the pathway in 69.7%, with MRI responsible in 22.3%, reducing to 10.3% in group 2. TP biopsies met the 28-day standard in significantly less cases (29.7%), compared to TR (67.4%, p<0.0001). CONCLUSION: Reserved MRI slots reduces time-to-diagnosis, and upfront MRI safely avoids biopsy in a significant proportion of men, whilst maintaining expected csPCa detection rates.

Evaluation of the photoneutron field produced in a medical linear accelerator.

The doses and spectra of photoneutrons produced in a medical linear accelerator with photon energies of 10 and 15 MV were evaluated. The Monte Carlo code, MCNPX, was used to simulate the transport of these photoneutrons around the head for 10 and 15 MV photons. The fully-described geometry of the accelerator head was used in this calculation. The photoneutron energy spectra and doses for various photon field sizes were calculated at each of 20 positions. The results indicate that the maximum dose equivalents are observed in 20 x 20 cm(2) case among photon fields. It was found the neutron average energy at isocenter for a 0 x 0 cm(2) field is 0.38 MeV for 10 MV and is 0.45 MeV for 15 MV. The neutron doses at 10 positions around the head in the treatment room of the operation facility at 10 and 15 MV were measured using the bubble detectors. Measurements were compared with the calculations under the same geometry in the experiment. It was found that the majority of the calculated results agreed to within the standard deviations of the measurements. These above results can be applied in the verification of maximum allowed neutron leakage percentage of treatment dose defined in the IEC. We have been employing them to derive the empirical formula for neutron dose equivalent level at the maze entrance of medical accelerator treatment rooms in a study that is still underway.

Sub-differentiating equivocal PI-RADS-3 lesions in multiparametric magnetic resonance imaging of the prostate to improve cancer detection.

PURPOSE: To evaluate sub-differentiation of PI-RADS-3 prostate lesions using pre-defined T2- and diffusion-weighted (DWI) MRI criteria, to aid the biopsy decision process. METHODS: 143 patients with PIRADS-3 index lesions on MRI underwent targeted transperineal-MR/US fusion biopsy. Radiologists with 2 and 7-years experience performed blinded retrospective second-reads using set criteria and assigned biopsy recommendations. Inter-reader agreement, Gleason score (GS), positive (PPV) predictive values (±95% confidence intervals) were calculated and compared by Fisher's exact test with Bonferroni-Hom correction. RESULTS: 43% (61/143) patients had GS 6-10 and 21% (30/143) GS≥3+4 cancer. For peripheral zone lesions, significant differences in any cancer detection were found for shape (0.26±0.13 geographical vs. 0.69±0.23 rounded; p=0.0055) and ADC (mild 0.21±0.12 vs marked 0.81±0.19; p=0.0001). For transition zone, significantly increased cancer detection was shown for location (anterior 0.63±0.15 vs. mid/posterior 0.31±0.14; p=0.0048), border (pseudo-capsule 0.32±0.14 vs. ill-defined 0.61±0.15; p=0.0092), and ADC (mild 0.35±0.12 vs marked restriction 0.68±0.17; p=0.0057). Biopsy recommendations had 62% inter-reader agreement (89/143). Experienced reader PPVs were significantly higher for any cancer with "biopsy-recommended" 0.61±0.11 vs. "no biopsy" 0.21±0.10 (p=0.0001), and for GS 7-10 cancers: 0.32±0.10 vs. 0.08±0.07, respectively (p=0.0003). CONCLUSION: Identification of certain objective imaging criteria as well as a subjective biopsy recommendation from an experienced radiologist can help to increase the predictive value of equivocal prostate lesions and inform the decision making process of whether or not to biopsy.

Degradation of biodiesel under different storage conditions.

This paper aimed to investigate the biodiesel degradation characteristics under different storage conditions. The qualities of twelve biodiesel samples, which were divided into 3 groups and stored at different temperatures and environments, were monitored at regular interval over a period of 52 weeks. Experimental results demonstrated that the biodiesel under test degraded less than 10% within 52 weeks for those samples stored at 4 and 20 degrees C while nearly 40% degradation was found for those samples stored at a higher temperature, i.e. 40 degrees C. The results suggested that high temperature, together with air exposure, greatly increase the biodiesel degradation rate. The temperature or air exposure alone, however, had little effect on biodiesel degradation. Water content in biodiesel will enhance biodiesel degradation due to hydrolysis but its effect is much less than the above two factors.

Quality improvement of transgenic cloned bovine embryos using an aggregation method: Effects on cell number, cell ratio, embryo perimeter, mitochondrial distribution, and gene expression profile.

The production of cloned embryos using conventional methods has extremely low success rates owing to low embryo quality. To improve the quality of cloned bovine embryos expressing enhanced green fluorescent protein (EGFP), we applied an aggregation culture method. The EGFP gene was transfected into bovine fetal fibroblasts using a retroviral vector system. Somatic cell nuclear transfer was performed using these cells, and the resulting embryos were cultured in aggregates or individually. Gene expression was analyzed by a microarray, and differentially expressed genes were validated by quantitative real-time polymerase chain reaction. The total number of cells per blastocyst and the ratio of inner cell mass cells to trophectoderm cells were higher in aggregated transgenic cloned blastocysts (agBL; 368.7 ± 109.6 and 1:4.8, respectively) than in in vitro-fertilized blastocysts (ivfBL; 189.8 ± 65.8 and 1:2.6, respectively) and nonaggregated transgenic cloned blastocysts (sBL; 113.1 ± 36.3 and 1:1.5, respectively; P < 0.05 and P < 0.01, respectively). Moreover, the blastocyst perimeter was larger in the agBL group than in the ivfBL and sBL groups (1168.8 ± 200.23 vs. 887.33 ± 187.62 and 678 ± 226.1 µm; P < 0.05). In addition, mitochondrial fluorescence intensity was higher in the agBL group than in the ivfBL and sBL groups (P < 0.05). The number of apoptotic cells per blastocyst was lower in the ivfBL and agBL groups than in the sBL group (3.7 ± 2.2 and 3.4 ± 2.1 vs. 6.7 ± 6.8; P < 0.05). The genes identified in the microarray belonged to 18 categories. Expression of the Krüppel-like factor 4 gene, which is associated with cell proliferation, development, and transcription, was 7.2-fold higher in the agBL group than in the ivfBL group (P < 0.05) but did not differ between the sBL and ivfBL groups (P > 0.05). Expression of the heat shock 70-kDa protein 1A gene, which is associated with apoptosis, was 12-fold higher in the sBL group than in the ivfBL and agBL groups (P < 0.05). Expression of a stemness-related gene (octamer-binding transcription factor 4) and trophectoderm-specific genes (homeobox protein CDX2 and keratin 18) was higher in the agBL group than in the sBL group (P < 0.05). However, expression of the stemness gene homeobox protein NANOG did not differ among the groups (P > 0.05). Taken together, these data suggest that the aggregation method improves the quality of cloned embryos expressing EGFP and might be helpful in animal cloning.

Percutaneous catheter drainage in treatment of urinary extravasation.

In the last two decades there has been a rapid growth in the percutaneous manipulation of the genitourinary tract. We would like to present 2 patients in whom CT-guided percutaneous drainage of urinary extravasation was employed successfully and review the pertinent literature.

Review of laparoscopic urology.

Laparoscopy in urology has been slow to develop in the United Kingdom. Much of the pioneering work has been done in America and continental Europe. It is gradually gaining in popularity as urologists and the general public become more aware of the advantages it offers in terms of patient morbidity and surgical results. The aim of this review is to summarize the development of laparoscopic urology to date and to examine the various indications and the benefits of its application.

Mediastinal teratoma associated with Klinefelter's syndrome.

The clinical and autopsy findings in a case of histologically benign teratoma of the mediastinum in a 19-year-old man with Klinefelter's syndrome are presented. A rough statistical analysis based on a review of the literature revealed that the incidence rate of Klinefelter's syndrome among the patients with mediastinal germ cell tumor is 30 to 40 times that of Klinefelter's syndrome among the general control population. The pathogenesis of this neoplasm appears to be related to the genetic abnormality in Klinefelter's syndrome, and this seems to predispose to the development of extragonadal mediastinal germ cell neoplasms.

Pineal germinoma with widespread extracranial metastases.

A case of primary pineal germinoma with widespread extracranial metastasis in a 36-year-old man is presented. A clinical work-up revealed bilateral pleural effusions, ascites, and metastatic lesions involving the lung. Cytology and electron microscopic study of the pleural and ascitic fluid and of the fine needle aspiration material revealed metastatic germinoma. Although the cytologic features were not distinct from those of anaplastic carcinoma, they were distinguishable from those of glial neoplasms, lymphoma, and sarcoma. The computed tomography findings, elevated human chorionic gonadotropin level, and electron microscopic features contributed significantly to the diagnosis of extracranial metastasis of the pineal germinoma. Metastatic spread most likely occurred via the ventriculoperitoneal shunt.

Imaging acute pancreatitis.

Acute pancreatitis is a common condition (thought to be increasing in incidence worldwide), which has a highly variable clinical course. The radiologist plays a key role in the management of such patients, from diagnosis and staging to identification and treatment of complications, as well as in determining the underlying aetiology. The aim of this article is (i) to familiarize the reader with the pathophysiology of acute pancreatitis, the appearances of the various stages of pancreatitis, the evidence for the use of staging classifications and the associated complications and (ii) to review current thoughts on optimising therapy.

A pregnant lady with intermittent vaginal bleeding (2007: 3b). Placenta percreta.

Placenta percreta is a potentially life-threatening complication of pregnancy, which is increasing in incidence. Ante-natal diagnosis with ultrasound and magnetic resonance imaging aids the obstetric team in planning further management. We present a case of placenta percreta with imaging and a brief review of the literature.

CAPS markers specific to Eb, Ee, and R genomes in the tribe Triticeae.

Wild Triticeae grasses serve as important gene pools for forage and cereal crops. Understanding their genome compositions is pivotal for efficient use of this vast gene pool in germplasm-enhancement programs. Several cleaved amplified polymorphic sequence (CAPS) markers were developed to distinguish the Eb, Ee, and R genomes. With the aid of disomic addition lines of wheat, it was confirmed that all 7 chromosomes of Eb, Ee, and R genomes carry these genome-specific CAPS markers. Thus, the identified CAPS markers are useful in detecting and monitoring the chromosomes of these 3 genomes. This study also provides evidence suggesting that some Purdue and Chinese germplasm lines developed for barley yellow dwarf virus (BYDV) resistance are different from those developed in Australia. Furthermore, Thinopyrum intermedium and Thinopyrum ponticum were shown to have different genome constitutions. Sequence analyses of the 1272 bp sequences, containing Ty3/gypsy retrotransposons, from the Eb, Ee, and R genomes also shed light on the evolution of these 3 genomes.

Minimal preparation CT for the diagnosis of suspected colorectal cancer in the frail and elderly patient.

Colorectal cancer is a common malignancy with an increased incidence in the elderly population. Traditional methods of evaluating this disease have included double contrast barium enema and colonoscopy. Unfortunately, in the frail and elderly patient, these investigations can be difficult to perform and are often not tolerated. Minimal preparation computed tomography (MPCT) of the colon has been suggested as an alternative in this patient population. In this technique, no bowel preparation is used apart from the administration of oral contrast medium. The patient is imaged only in the supine position, without per rectal insufflation of gas or barium. This article reviews the experience to date of MPCT in detecting colonic tumours, and compares its efficacy to the traditional methods. A meta-analysis of the studies allowed estimation of the pooled sensitivity of MPCT to be 83% (95% confidence interval: 76-89%), and pooled specificity to be 90% (95% CI: 85-94%). An added advantage of MPCT is the ability to identify extra-colonic pathology, and this aspect is also reviewed. In addition, the common radiological features and pitfalls in identifying colonic tumours by MPCT are discussed.

Anuria in transplant patient following inguinal herniorrhaphy.

We report ureteral ligation following inguinal herniorrhaphy in a transplant patient. Successful treatment was accomplished by percutaneous nephrostomy and ureteral reimplantation.

Percutaneous stone surgery in the obese: outcome stratified according to body mass index.

OBJECTIVE: To report our experience of percutaneous surgery for treating renal pelvicalyceal stones over 6 years, to show that this approach is feasible and safe in obese and morbidly obese patients, as the prevalence of obesity and stone disease has risen in the last 20 years. PATIENTS AND METHODS: We retrospectively reviewed the results of 223 percutaneous nephrolithotomies (PCNLs) by one urologist between 1995 and 2001. Patients were stratified into four groups according to the World Health Organization classification of body mass index (BMI), i.e. <25, 25-29.9 (overweight), 30-39.9 (obese) and > 40 kg/m(2) (morbidly obese). The outcomes of surgery in these four groups were compared. RESULTS: There were no statistically significant differences in operative duration, decrease in haemoglobin concentration, postoperative analgesic use, hospital stay and stone-free rates; nor was there a higher complication rate in patients who were obese. CONCLUSION: The outcome of PCNL is independent of the patients' BMI and results can be favourable in most patients. We therefore advocate treating obese patients with symptomatic stone disease based on individual status, using percutaneous surgery where appropriate.

Pulmonary vein tumor thrombosis and left atrial extension in lung carcinoma.

A case of lung carcinoma extending into left atrium through a pulmonary vein and mimicking left atrial myxoma is presented. The localized enlargement of a pulmonary vein is seen as a possible CT sign of pulmonary vein tumor thrombosis. Computed tomography (CT) and echocardiography are complementary in the correct diagnosis of this condition.

Comparison of the accuracy of bracket placement between direct and indirect bonding techniques.

An in vitro study was conducted to evaluate the accuracy of bracket placement for direct and indirect bonding techniques. Nineteen sets of duplicated Class II malocclusion models were divided into three groups: (1) one set for ideal bracket placement, (2) nine sets for direct bonding on mannequins, and (3) nine sets for indirect bonding. Both direct and indirect bonding were performed on all teeth except molars by nine faculty members from the Department of Orthodontics, University of Pennsylvania. The position of each bonded bracket from these two bonding groups was compared with that of the same tooth from the ideal group and to each other in terms of bracket height, mesiodistal position, and angulation. Our results indicated that both direct and indirect bonding techniques failed to execute ideal bracket placement. On individual teeth, there was no statistically significant difference in the accuracy of bracket placement between these two bonding techniques except for upper right second premolar and lower left central incisor, where indirect bonding yielded better results in bracket height (P < .05), and for lower left central incisor where indirect bonding was better in mesiodistal position (P < .05), and for upper right lateral incisor where direct bonding was closer to the ideal in angulation (P < .05). Overall, indirect bonding showed better bracket placement in bracket height (P < .05), whereas, no statistically significant difference was found between them regarding the angulation and mesiodistal position.

Primary mediastinal hemangiopericytoma: computed tomography correlation.

A case of primary mediastinal hemangiopericytoma with computed tomography correlation is presented. Although this is rare cause of mediastinal mass, the diagnosis should be considered when computed tomography of the mass shows contrast medium enhancement, particularly if there is a curvilinear encircling structure suggesting a large feeder vessel.