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Varicocele — MBBS Urology

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Definition

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Anatomy & Why It Is Predominantly Left-Sided (~90%)

• The left internal spermatic vein is longer and drains into the left renal vein at a right angle, transmitting higher hydrostatic pressure.
• The right spermatic vein drains obliquely into the IVC with lower pressure.
• Isolated right-sided varicocele is rare and should raise suspicion for a retroperitoneal/renal mass (especially if of sudden onset) compressing the right renal/IVC drainage — always investigate with CT/USG.
• The "nutcracker phenomenon" (compression of left renal vein between the aorta and superior mesenteric artery) may contribute in some cases.

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Epidemiology

• Develops during puberty (peak at Tanner stage 3), rarely seen below age 10
• Varicoceles do not spontaneously regress
• Associated with tall, thin body habitus (low BMI)
• Familial predisposition: 4–8× higher risk in first-degree relatives

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Clinical Features

Symptoms

• Often asymptomatic (majority discovered incidentally)
• Dull aching/dragging pain in the scrotum, especially on prolonged standing
• Heaviness or discomfort, worsening toward evening
• Male subfertility (most important clinical consequence)

Signs

• "Bag of worms" appearance/feel — classic description of dilated tortuous veins
• Examined in supine and standing positions with Valsalva maneuver
• Affected testis may be soft, smaller (testicular atrophy)
• Veins decompress in supine position (failure to do so suggests secondary cause)

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Grading (Clinical Classification)

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Pathophysiology — How It Causes Infertility

1. Countercurrent heat exchange failure — retrograde flow of warm corporeal blood around the testis raises intratesticular temperature → inhibits spermatogenesis (most accepted theory)
2. Oxidative stress — elevated reactive oxygen species → DNA fragmentation and sperm apoptosis
3. Reflux of renal/adrenal metabolites — toxic catecholamines/metabolites reflux down the spermatic vein
4. Increased hydrostatic pressure → hypoperfusion, stasis, hypoxia, toxin accumulation
5. Pituitary-gonadal hormonal dysfunction — altered FSH/testosterone levels
6. Elevated seminal microRNA for apoptosis pathways

Effect on semen parameters:

• ↓ Concentration, ↓ motility (most profound), ↓ morphology
• Progressive testicular atrophy

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Diagnosis

Physical Examination (cornerstone of diagnosis)

• Examine standing, with and without Valsalva
• Palpate spermatic cord; assess testicular volume (Prader orchidometer or ultrasound)
• Measure testicular volume: >20% asymmetry between testes is significant

Investigations

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Indications for Treatment

• Palpable varicocele + abnormal semen parameters (most common indication)
• Varicocele + testicular atrophy (especially in adolescents — can reverse with early treatment)
• Pain causing significant discomfort
• Subfertile couple (varicocele on male partner)

Note: Varicocele correction can reverse testicular atrophy in adolescents and improve semen parameters in adults.

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Treatment Options

Comparison of Treatment Modalities

Surgical Approaches

1. Retroperitoneal (Palomo) approach — mass ligation of internal spermatic veins; simple but higher recurrence
2. Inguinal (Ivanissevich) approach — ligation at the internal ring level
3. Subinguinal microsurgical varicocelectomy — gold standard; lowest recurrence and complication rates
4. Laparoscopic varicocelectomy — useful for bilateral cases

Non-surgical

• Percutaneous retrograde embolization — interventional radiology; coil or sclerosant placed via femoral vein → left renal vein → spermatic vein; fastest recovery (1 day); 10–15% technical failure rate

Watchful Waiting

• If chosen, natural pregnancy rate ~16%; IVF gives ~35% pregnancy rate

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Secondary Varicocele

• Caused by compression of the spermatic vein or renal vein by a mass (e.g., renal cell carcinoma, retroperitoneal lymphoma)
• Suspect when:
  • Right-sided varicocele
  • Does not decompress in supine position
  • Sudden onset in older men
• Investigate with CT abdomen/pelvis

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Key Points for Exams

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