Testicular Tumors

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Testicular Tumors Overview & Classification - The Ball Game Basics

  • Neoplasms of the testes; most common solid malignancy in men aged 15-35 years.
  • Classification:
    • Germ Cell Tumors (GCTs): ~95%; derived from primordial germ cells.
      • Seminoma (most common GCT)
      • Non-Seminomatous GCTs (NSGCTs)
    • Sex Cord-Stromal Tumors (SCSTs): ~5%; arise from supportive tissues (Sertoli, Leydig cells).
      • Leydig cell tumors
      • Sertoli cell tumors
  • Key Risk Factors:
    • Cryptorchidism (↑ 3-5x risk; most significant).
    • Family history; previous testicular GCT.
    • Klinefelter syndrome; testicular dysgenesis.

⭐ Cryptorchidism is the most significant predisposing factor for testicular germ cell tumors (especially seminoma).

Germ Cell Tumors: Seminoma - The Classic Contender

  • Most common testicular germ cell tumor (GCT), peak incidence 30s.
  • Gross: Homogenous, tan-yellow, lobulated cut surface; no hemorrhage/necrosis typically.
  • Micro: Sheets of uniform cells with clear cytoplasm & prominent nucleoli ("fried egg" appearance), separated by fibrous septa with lymphocytic infiltrate. Seminoma: Fried Egg Cells & Lymphocytic Infiltrate
  • Markers: Positive for PLAP (placental alkaline phosphatase), OCT3/4, KIT (CD117). ↑hCG in ~15% (syncytiotrophoblastic cells).
  • Excellent prognosis; highly radiosensitive & chemosensitive.

⭐ Seminomas are the male GCT equivalent of ovarian dysgerminomas.

  • 📌 Mnemonic: Seminoma = Sensitive (to radiation), Simple (uniform cells), Syncytiotrophoblasts (sometimes present, produce hCG).

Germ Cell Tumors: Non-Seminomatous (NSGCTs) - The Diverse Villains

  • Heterogeneous group with varied differentiation and aggressive potential. More aggressive than seminomas.
  • Often occur as mixed germ cell tumors.
TumorPeak Age / Key HistoMarkers (↑)Key Behavior
Embryonal Carcinoma20-30 yrs; hemorrhagic, pleomorphic cells, primitive glandsAFP (50%), hCG (50%)Aggressive
Yolk Sac Tumor<3 yrs (commonest); Schiller-Duval bodiesAFP (always)Good (kids)
Choriocarcinoma20-30 yrs; cytotropho- & syncytiotrophoblasts; early hematogenous spreadhCG (always, high)Highly Aggressive
Teratoma (Post-pub.)Variable; ≥2 germ layers (e.g., cartilage, glands); All potentially malignantOften normalVariable

⭐ Yolk Sac Tumors are the most common testicular tumor in infants and children (<3 years), characterized by pathognomonic Schiller-Duval bodies and consistently elevated AFP.

Sex Cord-Stromal & Other Tumors - The Specialized Players

  • Leydig Cell Tumors:
    • Androgen ↑ (precocious puberty in boys, gynecomastia in men).
    • Reinke crystals (eosinophilic, pathognomonic cytoplasmic inclusions).
    • Usually benign.
  • Sertoli Cell Tumors:
    • Rare; may produce estrogens.
    • Form tubules/cords.
    • Usually benign.
  • Testicular Lymphoma:
    • Most common testicular tumor in men >60 years.
    • Usually Diffuse Large B-cell Lymphoma (DLBCL).
    • Aggressive; often bilateral. Poor prognosis. Leydig cell tumor with Reinke crystals

⭐ Testicular Lymphoma is the most common testicular tumor in men over 60 years, typically DLBCL.

Clinical Approach & Staging - The Diagnostic Drill

  • Presentation: Typically painless testicular mass; may have dull ache/heaviness.
  • Key Investigations:
    • Scrotal Ultrasound: Initial imaging to confirm solid mass.
    • Serum Tumor Markers (AFP, β-hCG, LDH): Baseline pre-orchiectomy. β-hCG ↑ in ~15% seminomas. Aid diagnosis, staging, prognosis, monitoring.
  • Staging: AJCC TNM system; CT Chest/Abdomen/Pelvis for metastases.

⭐ Pure seminomas never produce AFP. If AFP is elevated, a non-seminomatous germ cell tumor (NSGCT) component is present.

High‑Yield Points - ⚡ Biggest Takeaways

  • Germ cell tumors (GCTs) comprise 95% of cases; cryptorchidism is a key risk factor.
  • Seminoma: most common GCT, radiosensitive, ↑PLAP, sometimes ↑hCG.
  • Yolk Sac Tumor: most common in infants/children <3 yrs, ↑AFP, Schiller-Duval bodies.
  • Choriocarcinoma: aggressive, early hematogenous spread, ↑↑hCG.
  • Leydig Cell Tumor: may cause precocious puberty (androgens) or gynecomastia (estrogens).
  • Teratoma: in adults malignant, in children benign; contains diverse tissues.
  • Lymphoma: most common testicular malignancy in men >60 years an_bilateral_often_B-cell_type_

Practice Questions: Testicular Tumors

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Which of the following statements about seminomas is false?

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Flashcards: Testicular Tumors

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Spermatocytic tumor is _____ for PLAP reactivity

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Spermatocytic tumor is _____ for PLAP reactivity

negative

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