Tuesday, July 31, 2012

Varicocele part 6


Laboratory Studies

·         When the clinical examination findings are equivocal, high-resolution color-flow Doppler ultrasonography is the diagnostic method of choice. The Male Infertility Best Practice Policy Committee of the American Urological Society recommends that imaging studies are not indicated for the standard evaluation unless the physical examination provides inconclusive findings. If a patient has sudden onset of a varicocele, a single right-sided varicocele, or any varicocele that is not reducible in the supine position, consider possible retroperitoneal pathology (eg, renal cell carcinoma) as the cause of spermatic vein compression. Investigate further with appropriate ultrasonography or CT scanning before repairing the varicocele.
·         Although varicocele diagnosis may be assisted with numerous methods (eg, venography, radionuclide angiography, thermography, ultrasonography), the current standard of care is high-resolution color-flow Doppler ultrasonography. High-resolution real-time scrotal ultrasonography using a 7- to 10-MHz probe defines a varicocele as a hollow tubular structure that grows following a Valsalva maneuver.
·         Color-flow Doppler ultrasonography defines the anatomic and physiologic aspects of varicoceles by using real-time ultrasonography and pulsed Doppler in the same scan. The color of the signal identifies the blood flow and direction within the varicocele. The characteristic reverse flow of varicoceles is confirmed by prolonged flow augmentation within a colored flow area; the flow changes color (ie, reverses) on real-time imaging.
·         Although the exact size definition is controversial, most surgeons consider a varicocele to be a vein 3 mm in diameter or larger while the patient is at rest. McClure et al define a varicocele as the presence of 3 or more veins, with 1 having a minimum resting diameter of 3 mm or an increase in venous diameter with the Valsalva maneuver. Because other surgeons use 2-3 mm as a cutoff, comparing results of these ultrasound-based varicocelectomy studies is difficult.

 

 

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