Publications by authors named "Dennis Pessis"

4 Publications

  • Page 1 of 1

An Atypical Presentation of Retroperitoneal Fibrosis.

Curr Urol 2017 Aug 30;10(3):157-159. Epub 2017 Jul 30.

Department of Urology, Rush University Medical Center, Chicago, Illinois, USA.

A 69-year-old man with a psoriatic arthritis treated with infliximab for 1 month presented to the urology clinic for lower urinary tract symptoms. He was found to have a new diagnosis of elevated creatinine. Computed tomography of the abdomen and pelvis revealed bilateral severe hydronephrosis with abnormal soft tissue thickening of the right renal pelvis and proximal ureter. Bilateral stents were placed after ureteroscopy demonstrated no abnormalities. A computed tomography-guided biopsy of the peri-ureteral lesions revealed fibroadipose tissue with sclerosis and extensive chronic inflammation consistent with retroperitoneal fibrosis. Infliximab was discontinued and the patient was started on corticosteroids. Follow-up magnetic resonance imaging of the abdomen and pelvis at 2 months revealed total resolution of soft tissue and inflammation along the proximal ureter bilaterally. Repeat imaging demonstrated no hydronephrosis after stents removal, and the patient's creatinine remains normal at 12 months follow-up.
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August 2017

Central zone lesions on magnetic resonance imaging: Should we be concerned?

Urol Oncol 2017 01 28;35(1):31.e7-31.e12. Epub 2016 Sep 28.

Department of Urology, Rush University Medical Center, Chicago, IL.

Introduction And Objective: The Prostate Imaging Reporting and Data System (PI-RADS) score was developed to evaluate lesions in the peripheral and transition zone on multiparametric magnetic resonance imaging (mpMRI) of the prostate. We aim to determine if the PI-RADS scoring system can be used to evaluate central zone lesions on mpMRI.

Materials And Methods: A retrospective review of 73 patients who underwent mpMRI/ultrasound (US) fusion-guided biopsy of 143 suspicious lesions between February 2014 and October 2015 was performed. All patients underwent a 3T mpMRI. Indications for mpMRI included an abnormal digital rectal examination, PSA velocity >0.75ng/dl/y, and patients on active surveillance. The mpMRI sequence involved T2-weighted imaging, diffusion-weighted imaging, and dynamic contrast enhancement. Using 3-dimensional model software (Invivo Corporation, Gainesville, FL, USA), a minimum of 3 magnetic resonance imaging (MRI)/US fusion-guided biopsy samples were taken from each prostate lesion seen on mpMRI irrespective of PI-RADS score, using local anesthesia in an outpatient clinic setting.

Results: A total of 73 patients underwent MRI/US fusion-guided biopsy of 85 peripheral zone lesions, 31 transitional zone lesions, and 27 central zone lesions. Only 2 (7%) of central zone lesions were positive for prostate cancer. Both patients had lesions which were graded as PI-RADS 3. Both the patients had multifocal lesions that encompassed≥50% of the central and transition zones on the sagittal view MRI images. Both patients previously had transrectal US-guided biopsy of the prostate which was negative for cancer. Both patients underwent a robotic-assisted laparoscopic prostatectomy, each revealing high-grade cancer.

Conclusions: Lesions involving only the central gland/zone seen on MRI are less concerning for malignancy and should not be given equal weight as peripheral zone lesions. In this series, no lesions involving solely the central gland/zone, regardless of PI-RADS score, was positive for malignancy on MRI/US fusion-guided biopsy. Consideration of a modified PI-RADS scoring system should be given to help identify central zone lesions with malignant potential.
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January 2017

Susceptibility to human immunodeficiency virus-1 infection of human foreskin and cervical tissue grown in explant culture.

Am J Pathol 2002 Sep;161(3):867-73

Department of Pediatrics, Division of Infectious Diseases, Children's Memorial Hospital, Chicago, Illinois 60614, USA.

Numerous studies have indicated a protective effect of male circumcision against acquisition of human immunodeficiency virus (HIV)-1. We investigated mechanisms responsible for the possible increased HIV-1 susceptibility of human foreskin. Foreskins from eight pediatric and six adult patients with (n = 3) and without (n = 11) histories of sexually transmitted disease were evaluated. Six cervical biopsies from HIV-1-seronegative women were included as controls. CD4(+) T cells, macrophages, and Langerhans' cells (LCs) were quantified using image analysis. Cells expressing HIV-1 co-receptors CCR5 and CXCR4 were quantified using immunofluorescence and image analysis. Foreskin biopsies were infected ex vivo in organotypic culture with HIV-1. HIV-1 DNA copies in foreskin and cervical mucosal tissue were compared and the infected cell phenotype was determined. Foreskin mucosa contained higher mean proportions of CD4(+) T cells (22.4%), macrophages (2.4%), and LCs (11.5%) in adults than in children (4.9%, 0.3%, and 6.2%, respectively) or in cervical mucosa (6.2%, 1.4%, and 1.5%, respectively). The highest proportions of CD4(+) T cells and LCs occurred in patients with a history of infection. Foreskin immune cells expressed predominantly the CCR5 HIV-1 co-receptor. Adult foreskin mucosa had greater susceptibility to infection with HIV(bal) than cervical mucosa or the external surface of foreskin tissue. Circumcision likely reduces risk of HIV-1 acquisition in men by decreasing HIV-1 target cells.
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September 2002

A phase 3, multicenter, open label, randomized study of abarelix versus leuprolide plus daily antiandrogen in men with prostate cancer.

J Urol 2002 Apr;167(4):1670-4

Princess Margaret Hospital, Toronto, Canada.

Purpose: We compared the endocrinological and biochemical efficacy of abarelix depot, a gonadotropin-releasing hormone antagonist, with that of a widely used combination of luteinizing hormone releasing hormone agonist and a nonsteroidal antiandrogen.

Materials And Methods: A total of 255 patients were randomized to receive open label 100 mg. abarelix depot or 7.5 mg. leuprolide acetate intramuscularly injection on days 1, 29, 57, 85, 113 and 141 for 24 weeks. Patients in the abarelix group received an additional injection on day 15 and those in the leuprolide acetate group received 50 mg. bicalutamide daily. Patients could continue treatment with study drug for an additional 28 weeks. The efficacy end points were the comparative rates of avoidance of testosterone surge (greater than 10% increase) within 7 days of the first injection and the rapidity of achieving reduction of serum testosterone to castrate levels (50 ng./dl. or less) on day 8. Patients were monitored for adverse events and laboratory abnormalities.

Results: Abarelix was more effective in avoidance of testosterone surge (p <0.001) and the rapidity of reduction of testosterone to castrate levels on day 8 (p <0.001) than combination therapy. No significant difference was seen between the groups in the initial rate of decline of serum prostate specific antigen or the ability to achieve and maintain castrate levels of testosterone. No unusual or unexpected adverse events were reported.

Conclusions: Abarelix as monotherapy achieves medical castration significantly more rapidly than combination therapy and avoids the testosterone surge characteristic of agonist therapy. Both treatments were equally effective in reducing serum prostate specific antigen, and achieving and maintaining castrate levels of testosterone.
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April 2002