Benjamin Kirk Canales

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PURPOSE We evaluated the efficacy of alfuzosin as medical expulsive therapy for distal ureteral stone passage. MATERIALS AND METHODS A total of 76 patients with a distal ureteral calculus provided consent for the study. Patients were randomized between placebo and study medication, and investigators and patients were blinded to the randomization scheme.(More)
OBJECTIVES Idiopathic calcium oxalate (CaOx) stones are believed to develop attached to papillary subepithelial deposits called Randall's plaques. Calcium phosphate (CaP) stones, conversely, are thought to arise within the inner medullary collecting ducts, enlarging and damaging surround tubular structures as they expand. If this is true, we theorize that(More)
OBJECTIVE To evaluate the effect of the early use of the vacuum erection device (VED) on erectile dysfunction (ED) and penile shortening after radical retropubic prostatectomy (RP), as these are important concerns for men choosing among treatment alternatives for localized prostate cancer. PATIENTS AND METHODS Twenty-eight men undergoing RP were(More)
Matrix stones are radiolucent bodies that present as soft muco-proteinaceous material within the renal collecting system. Following wide-angle X-ray diffraction (XRD) and scanning electron microscopy (SEM), we homogenized a surgically removed matrix stone, extracted and purified protein, and analyzed samples using tandem mass spectrometry for proteomic(More)
The surgical management of urolithiasis is an ever-changing discipline that presents unique challenges to the urologist. This article reviews the current minimally invasive treatment options for upper urinary tract urolithiasis. First it examines several factors that influence stone-free rates, including Hounsfield units of calculi, obesity, and lower pole(More)
PURPOSE To better stratify risk and to verify previous prevalence reports, we conducted a retrospective cohort study comparing the lifetime incidence of nephrolithiasis in patients with spondyloarthropathies (SpA) and rheumatoid arthritis (RA). PATIENTS AND METHODS Patients with SpA or rheumatoid factor-positive RA were identified from the rheumatology(More)
Angiomyofibroblastoma-like tumor (cellular angiofibroma) is a rare, circumscribed, slow-growing mesenchymal tumor that occurs predominantly in the vulva, perineum, and pelvis of women. We report two cases of this tumor in men arising as paratesticular masses of the scrotum, summarize the history of this tumor, and discuss why efforts should be made to(More)
OBJECTIVE  To investigate the efficacy and safety of alpha blockers in the treatment of patients with ureteric stones. DESIGN  Systematic review and meta-analysis. DATA SOURCES  Cochrane Central Register of Controlled Trials, Web of Science, Embase, LILACS, and Medline databases and scientific meeting abstracts to July 2016. REVIEW METHODS  Randomized(More)
PURPOSE We determined the effect of dietary fat and oxalate on fecal fat excretion and urine parameters in a rat model of Roux-en-Y gastric bypass surgery. MATERIALS AND METHODS Diet induced obese Sprague-Dawley® rats underwent sham surgery as controls (16), or Roux-en-Y gastric bypass surgery (19). After recovery, rats had free access to a normal(More)
PURPOSE We identified epidemiological risk factors for the initial urinary tract infection in females of college age compared to age matched controls. MATERIALS AND METHODS We performed a prospective cohort study from July 2001 to January 2006 at the student health care facility at our institution. A total of 180 women experiencing a first urinary tract(More)