Gustavo de la Roza¹, Asghar Naqvi¹, Kimball Clark²

Canadian Journal of Urology, Vol.16, No.1, pp. 4502-4506, 2009

Abstract Gastrointestinal stromal tumors (GISTs) are a rare and heterogeneous group of spindle cell neoplasms that have also been reported outside of gastrointestinal (GI) tract. These tumors are characterized by somatic mutations of c-KIT (CD117), a proto-oncogene that encodes a receptor tyrosine kinase normally expressed in the interstitial cell of Cajal that control the GI smooth muscle peristalsis, and an exquisite sensitivity to the action of the tyrokinase inhibitor imatinib mesylate (STI571; Gleevec). We report two cases of gastrointestinal stromal tumor identifi ed on prostatic biopsies, where a primary prostatic sarcoma was considered in the differential… More >

Sapan N. Ambani¹, Bruce L. Jacobs¹, Aleksandr M. Perepletchikov², Ronald L. Hrebinko, Jr.¹

Canadian Journal of Urology, Vol.16, No.2, pp. 4607-4610, 2009

Abstract The presentation of a synchronous renal cell carcinoma (RCC) and germ cell tumor (GCT) is rare. We report the case of a 57 year-old male who presented with a right renal mass and retroperitoneal lymphadenopathy. He underwent a successful right partial nephrectomy and retroperitoneal lymph node dissection, and the subsequent pathology revealed a stage I clear cell RCC and a retroperitoneal teratoma with a component of benign prostatic tissue. We briefl y discuss the rarity of this occurrence, the pathological features that helped support this diagnosis, and the likely etiologies of these synchronous lesions. More >

Michael C. Large, Hikmat Al-Ahmadie, Arieh L. Shalhav, Kevin C. Zorn

Canadian Journal of Urology, Vol.16, No.3, pp. 4690-4693, 2009

Abstract A 25-year-old female presented with worsening right fl ank pain and a 9 year history of a slow growing 4 centimeter calcifi ed renal mass. The lesion was resected by laparoscopic partial nephrectomy revealing a mixed epithelial and stromal tumor (MEST). This tumor has unusual features including the extensive amount of dystrophic calcifi cation and the young age at presentation. Herein, we present a focused review of the literature regarding MESTs, as well as a discussion of calcifi ed renal mass management. We conclude that laparoscopy may be utilized to safely perform nephron sparing surgery More >

Matthew H. Hayn, Timothy D. Averch, Stephen V. Jackman

Canadian Journal of Urology, Vol.16, No.4, pp. 4770-4773, 2009

Abstract Introduction: Surgical stress in patients with liver disease is associated with hepatorenal syndrome, coagulopathy, encephalopathy, sepsis, ARDS, and abnormalities of volume and electrolytes. These risks as well as the surgical difficulties associated with portal hypertension, varices, ascites, and thrombocytopenia limit the treatment options available to cirrhotic patients with renal masses. The decreased stress of laparoscopy may benefit patients with significant liver disease.
Methods: We performed a retrospective chart review of three patients with cirrhosis and renal masses who underwent laparoscopic renal surgery.
Results: The mean patient age was 56 years old. Two patients had Child-Pugh class B cirrhosis… More >

Behrooz Azizi^1,2, Thomas Whelan^2,3, Michael Morse^2,3

Canadian Journal of Urology, Vol.16, No.6, pp. 4921-4923, 2009

Abstract Purpose: To determine the incidence of malignancy in resected renal tumors in a subpopulation of Canadian patients and the significance of tumor size, patient's demographics, and whether the tumor was an incidental finding.
Methods: Medical records of 168 consecutive nephrectomies performed between March 2003 and June 2008 at our institution were reviewed retrospectively.
Results: Average age of the patients was 61 years old (SD 11, range 28-89) and male to female ratio was 1.3:1. Total of 180 masses were resected in 168 nephrectomies (128 radical, 40 partial) during the study period. Of the 180 masses, 20 (11%) were… More >

Zhang¹ WD, DS Liu², JC Tian^1*, FL He¹

Phyton-International Journal of Experimental Botany, Vol.78, pp. 147-154, 2009, DOI:10.32604/phyton.2009.78.147

Abstract Soil arsenic contamination becomes a potential agricultural and environmental hazard worldwide, and has been a serious problem for safe food production. A field experiment on soil contamination was conducted on four wheat varieties (Jimai, Gaoyou, Weimai and Wennong) in Eastern China, using 50 or 100 mg arsenic/kg soil. Biomass production and yield components were determined and arsenic concentrations were measured in plant tissues. Differential arsenic effects on wheat varieties were determined at maturity. Results showed that addition of arsenic significantly (p<0.05) reduced root, stem and spike dry weight and yield components, which resulted in the… More >

Janja Kramer, Renata Jecl, Leopold Skerget

The International Conference on Computational & Experimental Engineering and Sciences, Vol.12, No.4, pp. 147-148, 2009, DOI:10.3970/icces.2009.012.147

Abstract A numerical study of double diffusive natural convection in porous media due to opposing buoyancy forces is reported, using the Boundary Domain Integral Method (BDIM). There have been several reported studies dealing with natural convection in porous media, mainly because of its importance in several industrial and technological applications. Less attention, however, has been dedicated to the so-called double diffusive problems, where density gradients occur due to the effects of combined temperature and concentration buoyancy. The current investigation is focused on the special problem, where the thermal and solutal buoyancy forces are opposing each other.
The… More >

M.R. Arab^1,2, E. Semma³, B. Pateyron¹, M. El Ganaoui¹

FDMP-Fluid Dynamics & Materials Processing, Vol.5, No.2, pp. 161-176, 2009, DOI:10.3970/fdmp.2009.005.161

Abstract In this work, flows in porous media are simulated by using a Lattice Boltzmann Method (LBM). A model D2Q9 with a single collision operator is proposed. This method is applied on 2D digital images obtained by a Scanning Electron Microscope technique (SEM), and followed by a special treatment in order to obtain an image of synthesis that is finally read by the numerical code. The first results tested on two-dimensional configurations show the reliability of this strategy in simulating with a good accuracy phenomena of heat and mass transport. The numerical study is extended to More >

Aouachria Z¹

FDMP-Fluid Dynamics & Materials Processing, Vol.5, No.2, pp. 137-148, 2009, DOI:10.3970/fdmp.2009.005.137

Abstract This work treats heat and mass transfer by natural convection along a vertical wall in porous media imbibed by fluid, using an integral method. The problem governing parameters are the buoyancy ratio,N, and the Lewis number, Le The results for the local Nusselt and Sherwood numbers are presented for a large range of these parameters. The concentration and thermal boundary layer thickness are also determined. We observe that our results are in good agreement with those obtained by Bejan and Khair (1985). More >

Anil A. Thomas¹, Ryan Hedgepeth¹, Timur P. Sarac², Sandip P. Vasavada¹

Canadian Journal of Urology, Vol.15, No.2, pp. 4024-4026, 2008

Abstract Acquired bladder diverticula due to bladder outlet obstruction are not uncommon in the adult male population. Congenital diverticula originate adjacent to the trigone and are rarely diagnosed in adults. We report an unusual case of a diverticulum arising adjacent to an ectopic ureter located on the left lateral wall near the dome of the bladder. Although the diverticulum appeared to be congenital, its large size was likely a result of high pressure voiding. The patient underwent a transurethral resection of the prostate to reduce his bladder outlet obstruction, and subsequently underwent an open diverticulectomy. More >