honeypot link
skip to main content
  • follow us on facebook
Merck Manual LogoMerck ManualProfessional Version
MEDICAL TOPICSRESOURCESDRUG INFOCOMMENTARYPROCEDURESQUIZZESABOUT US
homeMEDICAL TOPICSRESOURCES
Search icon
  1. <$name
    Urology
    Approach to the Patient With Urologic Issues
    • Evaluation of the Patient With Urologic Issues
      • History
      • Physical Examination
        • Costovertebral angle
        • Abdomen
        • Rectum
        • Groin and genitals
      • Testing
        • Testing references
    • Genitourinary Imaging Tests
      • Plain Radiographs Without Contrast
      • Radiographs With Use of Contrast
        • IV urography (IVU)
        • Percutaneous antegrade urography
        • Retrograde urography
        • Cystography and cystourethrography
        • Angiography
      • Ultrasound
      • Computed Tomography
      • Magnetic Resonance Imaging
      • Radionuclide Scanning
    • Bladder Catheterization
      • Catheters
      • Urethral catheterization
      • Suprapubic catheterization
      • Reference
    • Biopsy of the Kidneys, Bladder, and Prostate
      • Renal biopsy
      • Bladder biopsy
      • Prostate biopsy
      • Urine cytology
      • References
    • Cystoscopy
    • Urethral Dilation
    Symptoms of Genitourinary Disorders
    • Dysuria
      • Pathophysiology
      • Etiology
      • Evaluation
        • History
        • Physical examination
        • Red flags
        • Interpretation of findings
        • Testing
      • Treatment
        • Treatment reference
      • Key Points
    • Hematospermia
      • Pathophysiology
      • Etiology
      • Evaluation
        • History
        • Physical examination
        • Red flags
        • Interpretation of findings
        • Testing
      • Treatment
      • Key Points
    • Priapism
      • Pathophysiology
        • Ischemic priapism
        • Nonischemic priapism
      • Etiology
      • Evaluation
        • History
        • Physical examination
        • Red flags
        • Interpretation of findings
        • Testing
      • Treatment
        • Ischemic priapism
        • Stuttering priapism
        • Nonischemic priapism
        • Refractory priapism
      • Key Points
    • Painless Scrotal Mass
      • Etiology
      • Evaluation
        • History
        • Physical examination
        • Red flags
        • Interpretation of findings
        • Testing
      • Treatment
      • Key Points
    • Scrotal Pain
      • Etiology
      • Evaluation
        • History
        • Physical examination
        • Red flags
        • Interpretation of findings
        • Testing
      • Treatment
      • Geriatrics Essentials
      • Key Points
    • Urinary Frequency
      • Pathophysiology
      • Etiology
      • Evaluation
        • History
        • Physical examination
        • Red flags
        • Interpretation of findings
        • Testing
      • Treatment
      • Geriatrics Essentials
      • Key Points
    Benign Prostate Disease
    • Benign Prostatic Hyperplasia
      • General reference
      • Pathophysiology
      • Symptoms and Signs
        • Lower urinary tract symptoms
        • Urinary retention
        • Symptom scores
        • Digital rectal examination
        • Symptom references
      • Diagnosis
        • Prostate-specific antigen (PSA) levels
        • Other testing
        • Diagnosis references
      • Treatment
        • Urinary retention
        • Pharmacotherapy
        • Surgery
        • Other procedures
        • Treatment references
      • Key Points
    • Prostatitis
      • Etiology
      • Classification
      • Symptoms and Signs
      • Diagnosis
      • Treatment
        • Acute bacterial prostatitis
        • Chronic bacterial prostatitis
        • Chronic prostatitis/chronic pelvic pain syndrome
        • Asymptomatic inflammatory prostatitis
        • Treatment references
      • Key Points
    • Prostate Abscess
      • Reference
      • Symptoms and Signs
      • Diagnosis
      • Treatment
    How To Do Genitourinary Procedures
    • How To Do Paraphimosis Reduction Without Dorsal Slit
      • Indications
      • Contraindications
      • Complications
      • Equipment
      • Additional Considerations
      • Positioning
      • Step-by-Step Description of Procedure
      • Aftercare
      • Warnings and Common Errors
      • Tips and Tricks
      • Reference
    • How To Do Urethral Catheterization in a Male
      • Indications
      • Contraindications
      • Complications
      • Equipment
      • Additional Considerations
      • Relevant Anatomy
      • Positioning
      • Step-by-Step Description of Procedure
      • Aftercare
      • Warnings and Common Errors
      • Tips and Tricks
    • How To Do Urethral Catheterization in a Female
      • Indications
      • Contraindications
      • Complications
      • Equipment
      • Additional Considerations
      • Relevant Anatomy
      • Positioning
      • Step-by-Step Description of Procedure
      • Aftercare
      • Warnings and Common Errors
      • Tips and Tricks
    • How To Remove a Zipper From a Penis
      • Indications
      • Contraindications
      • Complications
      • Equipment
      • Additional Considerations
      • Positioning
      • Step-by-Step Description of Procedure
      • Aftercare
      • Warnings and Common Errors
      • Tips and Tricks
    Male Sexual Function and Dysfunction
    • Overview of Male Sexual Function and Dysfunction
      • Libido
      • Erection
      • Emission, Ejaculation, and Orgasm
        • Ejaculatory dysfunction
      • References
    • Erectile Dysfunction
      • Reference
      • Etiology
        • Etiology reference
      • Diagnosis
      • Testing
      • Treatment
        • Medications for erectile dysfunction
        • Mechanical devices and procedures
        • Surgery for erectile dysfunction
        • Treatment references
      • Key Points
    Obstructive Uropathy
    • Obstructive Uropathy
      • Etiology
      • Pathophysiology
        • Obstructive nephropathy
      • Symptoms and Signs
      • Diagnosis
        • Evaluation of suspected urethral obstruction
        • Evaluation of ureteral or more proximal obstruction
        • Evaluation of hydronephrosis without apparent obstruction
        • Diagnosis reference
      • Treatment
        • Treatment reference
      • Prognosis
      • Key Points
    Penile and Scrotal Disorders
    • Balanitis, Posthitis, and Balanoposthitis
      • Symptoms and Signs
      • Diagnosis
      • Treatment
        • Treatment references
    • Cutaneous Penile Lesions
      • Balanitis xerotica obliterans
      • Carcinoma in situ
      • Penile lichen planus
      • Pearly penile papules
      • Contact dermatitis of the penis
      • Reference
    • Epididymitis
      • Etiology
        • Bacterial epididymitis
        • Nonbacterial epididymitis
      • Symptoms and Signs
      • Diagnosis
      • Treatment
        • Treatment reference
      • Key Points
      • More Information
    • Orchitis
      • References
      • Symptoms and Signs
      • Diagnosis
      • Treatment
    • Peyronie Disease
      • General reference
      • Treatment
        • Treatment references
    • Phimosis and Paraphimosis
      • Phimosis
      • Paraphimosis
    • Testicular Torsion
      • General references
      • Symptoms and Signs
        • Symptoms and signs reference
      • Diagnosis
      • Treatment
      • Key Points
      • More Information
    • Urethral Stricture
      • General reference
      • Symptoms and Signs
      • Diagnosis
      • Treatment
    Urinary Calculi
    • Urinary Calculi
      • References
      • Etiology
        • Etiology references
      • Pathophysiology
      • Symptoms and Signs
      • Diagnosis
        • Urinalysis
        • Imaging tests
        • Identifying the cause
        • Diagnosis references
      • Treatment
        • Analgesia
        • Expulsive therapy
        • Calculus removal
        • Calculus dissolution
        • Treatment reference
      • Prevention
        • Prevention references
      • Key Points
    Voiding Disorders
    • Overview of Voiding
    • Urinary Incontinence in Adults
      • Types
      • General references
      • Etiology
        • Transient incontinence
        • Established incontinence
      • Evaluation
        • History
        • Physical examination
        • Testing
        • Evaluation reference
      • Treatment
        • General measures
        • Bladder training
        • Kegel exercises
        • Medications
        • Urge incontinence
        • Stress incontinence
        • Overflow incontinence
        • Refractory incontinence
      • Treatment references
      • Key Points
    • Urinary Retention
      • Diagnosis
      • Treatment
        • Treatment reference
      • Key Points
    • Neurogenic Bladder
      • Symptoms and Signs
      • Diagnosis
      • Treatment
        • Catheterization
        • Medications and other therapies
        • Surgery
      • Key Points
    • Interstitial Cystitis
      • General reference
      • Symptoms and Signs
      • Diagnosis
        • Diagnosis references
      • Treatment
        • Choice of treatment
        • Nonpharmacologic (or behavioral) interventions
        • Pharmacotherapy
        • Procedures and major surgery
        • Treatment references
      • Key Points
    MSD
    • About
    • Disclaimer
    • Permissions
    • Privacy
    • Cookie Preferences
    • Terms of use
    • Partnerships
    • Contact Us
    • Global Medical Knowledge
    • Veterinary Manual
    • Print Editions
    • Mobile App
    • follow us on facebook
    This icon serves as a link to download the eSSENTIAL Accessibility assistive technology app for individuals with physical disabilities. It is featured as part of our commitment to diversity and inclusion. M
    • follow us on facebook
    This icon serves as a link to download the eSSENTIAL Accessibility assistive technology app for individuals with physical disabilities. It is featured as part of our commitment to diversity and inclusion. M
    MSD

    Copyright© 2026Merck & Co., Inc., Rahway, NJ, USA and its affiliates. All rights reserved.