Scrotal Swellings & Testicular Tumours

Scrotal swellings are a bread-and-butter clinical examination topic and a recurring NEET PG favourite. The single most important first step is to decide whether you can get above the swelling (intra-scrotal) or cannot get above it (inguino-scrotal). This one question separates a hydrocele/epididymal cyst/tumour from an inguinal hernia or a congenital hydrocele.

Clinical approach: the "get above it" rule

The examiner's mantra: examine the lump, the cord, and the opposite side, then characterise by transillumination, fluctuation, and relation to the testis.

Stepwise approach: Can I get above the swelling? → No → think hernia (reducible, cough impulse, bowel sounds) or congenital/infantile hydrocele → Yes → Is it separate from the testis? → Yes, separate & cystic → epididymal cyst / spermatocele → No, testis is part of the swelling → Is it transilluminant? → Yes → hydrocele → No (solid, opaque) → testicular tumour / haematocele / chronic pyocele.

High-yield: A normal testis sensation is lost in a vaginal hydrocele (you cannot feel the testis separately because fluid surrounds it), but is preserved in an epididymal cyst (testis felt separately below the cyst).

Feature	Hydrocele	Epididymal cyst	Varicocele	Testicular tumour
Get above it	Yes	Yes	Yes	Yes
Transillumination	Positive	Positive ("Chinese lantern")	Negative	Negative
Testis palpable separately	No (encased)	Yes	Yes	Is the mass
Consistency	Cystic, fluctuant	Cystic, lobulated	"Bag of worms"	Hard, heavy, nodular
Cough impulse	No	No	Impulse on standing/Valsalva	No
Lying down	Persists	Persists	Decompresses/disappears	Persists

Hydrocele

A hydrocele is an abnormal collection of serous fluid within the tunica vaginalis (or along the processus vaginalis). It is the commonest cause of a painless, transilluminant scrotal swelling.

Classification (very high-yield)

• Vaginal hydrocele – fluid confined to tunica vaginalis around the testis; commonest type; the testis is not palpable separately.
• Infantile hydrocele – tunica + cord up to deep ring, but not communicating with peritoneum; you cannot get above it.
• Congenital hydrocele – patent processus vaginalis communicating with peritoneal cavity; fluid empties on lying down; associated with hernia; you cannot get above it.
• Hydrocele of the cord (encysted hydrocele of cord) – smooth swelling along the cord; traction on testis makes it move down (pulls the swelling), distinguishing it from other cord swellings.
• Hydrocele en bisac – two intercommunicating sacs, one above and one below the neck of the scrotum.

Etiology

• Primary (idiopathic) – defective absorption by the tunica; commonest; usually elderly, large, lax.
• Secondary – to underlying pathology: epididymo-orchitis, trauma, tumour, TB, filariasis (lymphatic obstruction → chylocele).

High-yield: Always examine the testis after aspirating/excluding fluid. A secondary hydrocele over a testicular tumour is a classic trap — never miss the underlying malignancy. If a hydrocele is lax and the testis cannot be assessed, do an ultrasound.

Investigation & treatment

• Transillumination at the bedside; scrotal USG is the investigation of choice when the testis cannot be felt or malignancy is suspected.
• Treatment: definitive is surgical. Lord's plication (for thin-walled sac), Jaboulay's eversion of the sac (for thick-walled sac), and excision. Aspiration alone recurs and is reserved for unfit patients.

Varicocele

Dilatation and tortuosity of the pampiniform plexus of veins. Classically described as a "bag of worms" that is more prominent on standing and decompresses on lying down.

High-yield: Varicocele is left-sided in ~85–90% of cases. Reasons: (1) left testicular vein drains into the left renal vein at a right angle (right drains directly into IVC at an acute angle); (2) the left renal vein may be compressed between the SMA and aorta (nutcracker effect); (3) absent/incompetent valves; (4) longer course on the left.

High-yield: A sudden-onset, right-sided, or non-decompressing varicocele in an older man should raise suspicion of a retroperitoneal/renal malignancy obstructing venous drainage (left → renal cell carcinoma involving renal vein). Investigate with abdominal imaging.

Grading (clinical):

1. Grade I – palpable only on Valsalva.
2. Grade II – palpable without Valsalva, not visible.
3. Grade III – visible through scrotal skin.

Varicocele is an important reversible cause of male infertility (raised scrotal temperature, oligoasthenospermia, reduced testicular volume). Treatment: varicocelectomy (microsurgical subinguinal is best, lowest recurrence/hydrocele rate) or radiological embolisation, indicated for pain, infertility with abnormal semen, or testicular growth arrest in adolescents.

Epididymal cyst & spermatocele

• Epididymal cyst – multiloculated, brilliantly transilluminant ("Chinese lantern"), lies in the head of epididymis, above and behind the testis, contains clear fluid.
• Spermatocele – unilocular, contains barley-water-like (opalescent, sperm-laden) fluid, less transilluminant.

Both are benign; treat only if symptomatic (excision).

Epididymo-orchitis

Acute inflammation of the epididymis ± testis, presenting with painful, swollen, tender, erythematous hemiscrotum.

Etiology by age

Age group	Likely organism
< 35 yrs, sexually active	Chlamydia trachomatis, Neisseria gonorrhoeae (STI)
> 35 yrs / children / catheterised	E. coli and other coliforms (UTI route)
Mumps orchitis	Paramyxovirus (post-pubertal; often bilateral, post-parotitis)
Chronic / beaded vas	Mycobacterium tuberculosis

Diagnosis: distinguishing from torsion (exam-critical)

Feature	Epididymo-orchitis	Testicular torsion
Age	Any; often >18	Peak 12–18 yrs
Onset	Gradual (hours–days)	Sudden, severe
Cremasteric reflex	Present	Absent
Prehn's sign (relief on elevation)	Positive (pain relieved)	Negative (no relief)
Position	Normal lie	High-riding, horizontal lie
Doppler flow	Increased	Reduced/absent
Fever/dysuria/pyuria	Common	Absent

High-yield: Torsion is a surgical emergency — the testis must be salvaged within ~6 hours. When in doubt in a young boy, explore; do not wait for imaging. A positive Prehn's sign and present cremasteric reflex favour epididymo-orchitis, but they are not reliable enough to rule out torsion.

Management of epididymo-orchitis: rest, scrotal support, analgesia, and antibiotics targeting the likely organism — ceftriaxone + doxycycline for suspected STI (<35 yrs); fluoroquinolone (ofloxacin/levofloxacin) for coliform/UTI-related disease. Treat the partner in STI cases.

Testicular tumours

The most clinically important solid scrotal swelling. Present as a painless, hard, heavy testicular lump that does not transilluminate. Peak incidence in young men (15–35 yrs).

Risk factors

• Cryptorchidism / undescended testis – strongest risk factor; risk persists (though reduced) even after orchidopexy; the contralateral normally-descended testis also carries increased risk.
• Prior contralateral testicular tumour, family history, infertility, Klinefelter syndrome (mediastinal germ cell tumours), HIV, testicular microlithiasis.

Classification

95% are germ cell tumours (GCT), broadly split into seminoma and non-seminomatous germ cell tumours (NSGCT).

• Seminoma – commonest single type, peak ~30–40 yrs, radiosensitive, good prognosis. Variants: classic, spermatocytic (elderly, indolent), anaplastic.
• NSGCT – includes:
  • Embryonal carcinoma – aggressive.
  • Yolk sac tumour (endodermal sinus) – commonest testicular tumour in infants/children; secretes AFP; Schiller-Duval bodies are pathognomonic.
  • Choriocarcinoma – most aggressive, early haematogenous spread; markedly raised beta-hCG; may cause gynaecomastia/thyrotoxicosis.
  • Teratoma – may be mature/immature.
• Mixed GCT – common; behaves as NSGCT.
• Sex cord–stromal tumours – Leydig cell (androgens/oestrogens → precocious puberty or gynaecomastia; Reinke crystals) and Sertoli cell tumours; mostly benign.
• Secondary – lymphoma is the commonest testicular tumour in men >60 yrs and the commonest bilateral testicular tumour.

Tumour markers (extremely high-yield)

Marker	Source	Seminoma	NSGCT
AFP	Yolk sac, embryonal	Never raised in pure seminoma	Raised (yolk sac, embryonal)
beta-hCG	Syncytiotrophoblast	May be mildly raised (~10–15%)	Often raised (choriocarcinoma, embryonal)
LDH	Tumour bulk/turnover	Useful for burden & monitoring	Useful for burden & monitoring
PLAP	Placental alkaline phosphatase	Marker of seminoma	—

High-yield: A raised AFP means the tumour is NOT a pure seminoma — it must be treated as NSGCT regardless of histology, because pure seminoma never produces AFP. This is one of the most repeated single-best-answer facts in NEET PG.

High-yield: beta-hCG half-life ≈ 24–36 hours; AFP half-life ≈ 5–7 days. Failure of markers to fall as expected after orchidectomy indicates residual/metastatic disease.

Investigation & approach

Stepwise: Suspicious solid testicular mass → Scrotal USG (investigation of choice; hypoechoic intratesticular mass) → Serum tumour markers (AFP, beta-hCG, LDH) before orchidectomy → High (inguinal) radical orchidectomy for diagnosis + treatment → Staging CT chest/abdomen/pelvis → repeat markers post-op.

High-yield: Trans-scrotal biopsy/aspiration is contraindicated — it violates fascial planes and alters lymphatic drainage (risk of scrotal skin/inguinal node seeding). Diagnosis is by high inguinal orchidectomy with early cord clamping, never a scrotal approach.

Spread & staging

• Lymphatic spread follows the testicular vessels to para-aortic (retroperitoneal) nodes at the level of L1–L2 (testis is a retroperitoneal organ embryologically) — not to inguinal nodes unless scrotal skin is involved.
• Haematogenous spread (especially choriocarcinoma) to lungs, liver, brain.
• Royal Marsden / TNM staging: Stage I = confined to testis; Stage II = infradiaphragmatic (para-aortic) nodes; Stage III = supradiaphragmatic nodes; Stage IV = visceral metastases.

Management (drug & modality of choice)

• All cases: high inguinal radical orchidectomy first.
• Seminoma – exquisitely radiosensitive and chemosensitive. Stage I: surveillance or adjuvant carboplatin/para-aortic radiotherapy. Advanced: platinum-based chemotherapy.
• NSGCT – chemotherapy of choice is BEP (Bleomycin, Etoposide, cisPlatin). Retroperitoneal lymph node dissection (RPLND) for selected residual/nodal disease. Beware bleomycin-induced pulmonary fibrosis.
• Offer sperm banking before chemo/RT. Consider a testicular prosthesis.

High-yield: Testicular GCTs are among the most curable solid cancers — even metastatic disease has high cure rates with platinum-based chemotherapy (cisplatin-containing regimens revolutionised prognosis).

Complications

• Hydrocele: infection (pyocele), haematocele, rupture, atrophy of testis from pressure, calcification.
• Varicocele: infertility, testicular atrophy.
• Epididymo-orchitis: abscess, infarction, infertility, chronic pain, secondary hydrocele; mumps → bilateral atrophy.
• Testicular tumour: metastasis, marker-monitoring relapse; treatment complications — bleomycin lung, cisplatin nephro/ototoxicity, RPLND → retrograde ejaculation (sympathetic nerve injury).

Key differentials of a scrotal swelling

• Cannot get above: inguinoscrotal hernia, congenital/infantile hydrocele.
• Transilluminant, get above: vaginal hydrocele, epididymal cyst, spermatocele, infantile hydrocele.
• Non-transilluminant, get above: testicular tumour, varicocele, haematocele, chronic pyocele, TB epididymitis, gumma.
• Acute painful scrotum: torsion (emergency), epididymo-orchitis, torsion of appendix testis (blue dot sign), strangulated hernia, Fournier's gangrene (necrotising fasciitis — surgical emergency).

High-yield: Haematocele (blood in tunica, post-trauma) does not transilluminate and feels heavy — a common reason a "hydrocele" fails transillumination. Older clotted haematoceles can mimic a tumour.

Recently asked / exam angle

• AFP is never elevated in pure seminoma → if raised, manage as NSGCT (repeatedly tested single-best-answer).
• Commonest testicular tumour in children = yolk sac tumour (AFP, Schiller-Duval bodies); in elderly >60 = lymphoma; in young adults overall = seminoma.
• Schiller-Duval bodies → yolk sac tumour; Reinke crystals → Leydig cell tumour. Image/spot questions.
• Varicocele left-sided predominance and its anatomical reason (left testicular vein → left renal vein at right angle); right-sided/sudden varicocele → suspect renal/retroperitoneal tumour.
• Trans-scrotal biopsy is contraindicated in suspected testicular cancer; diagnosis by high inguinal orchidectomy.
• Testicular lymphatic drainage to para-aortic nodes, not inguinal — a recurrent anatomy-linked question.
• BEP regimen for NSGCT and bleomycin pulmonary fibrosis as the limiting toxicity.
• Prehn's sign / cremasteric reflex to differentiate torsion from epididymo-orchitis; torsion salvage window ~6 hours.
• Lord's plication vs Jaboulay's procedure for hydrocele (thin vs thick sac).
• Mumps orchitis is post-pubertal, often bilateral, causes infertility.

Rapid revision

1. Get above the swelling? No → hernia/congenital hydrocele; Yes → intra-scrotal pathology.
2. Transilluminant + testis not separately palpable = vaginal hydrocele; transilluminant + above-and-behind testis = epididymal cyst.
3. Always do scrotal USG if the testis cannot be assessed under a lax hydrocele — exclude underlying tumour.
4. Lord's plication = thin sac; Jaboulay's eversion = thick sac; aspiration recurs.
5. Varicocele is left-sided (~85–90%); "bag of worms"; reversible cause of infertility; sudden right-sided → image the abdomen.
6. Torsion = emergency, salvage within 6 h; absent cremasteric reflex, negative Prehn's, high-riding testis, absent Doppler flow → explore, don't delay.
7. Epididymo-orchitis: <35 yrs STI (ceftriaxone + doxycycline)**; **>35 yrs coliforms (fluoroquinolone).
8. Cryptorchidism is the strongest risk factor for testicular tumour; risk also raised in the contralateral testis.
9. AFP never raised in pure seminoma; if raised → treat as NSGCT. beta-hCG half-life ~24–36 h, AFP ~5–7 days.
10. Yolk sac tumour = commonest in children (Schiller-Duval bodies); lymphoma = commonest >60 and commonest bilateral.
11. Diagnosis/treatment = high inguinal radical orchidectomy; trans-scrotal biopsy contraindicated; drainage to para-aortic nodes.
12. Seminoma is radiosensitive; NSGCT → BEP chemotherapy; watch for bleomycin lung fibrosis; offer sperm banking first.