Testis

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The testis, plural testes, are important for survival of the species. Tumours occasionally arise in 'em. They generally are not biopsied.

If the testis is biopsied, it is usually for fertility -- to understand whether the man is really azoospermic.

Normal testis

Gross

Anatomy - deep to superficial:

  • Tunica albuginea - fibrous layer.
  • Tunica vaginalis - thin mesothelial layer.

Microscopic

Seminiferous tubules

  • Sertoli cells (AKA sustentacular cell AKA nurse cell).
    • Large cells with oval nucleus.
  • Primary spermatocyte.
    • Small cells with dark nucleus on basement membrane.
  • Secondary spermatocyte.
    • Rarely seen on light microscopy.
  • Spermatids.
    • Round small.
    • Usually close to the centre of the lumen.
  • Spermatozoa.
    • You don't see the tail on light microscopy.

Images

  • Seminiferous tubule and sperm - low mag. (WC/Nephron)

  • Seminiferous tubule and sperm - high mag. (WC/Nephron)

  • Benign seminiferous tubules and ITGCN. (WC/Nephron)

Interstitial

Image

  • Leydig cells - very high mag. (WC/Nephron)

Associated structures

  • Epididymis - stores the sperm.
    • Pseudostratified epithelium with cilia.

Image:

Rete testis

Microscopic:

  • Delicate anastomosing channels lined by cuboid epithelium.

Images

  • Rete testis (WC/Nephron)

www:

Appendix of testis

Muellerian duct remnant.

Microscopic:

  • Polypoid structure.

Images:

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 TESTICLE, RIGHT, ORCHIECTOMY:
- TESTICLE WITHOUT APPARENT PATHOLOGY.
- NEGATIVE FOR INTRATUBULAR GERM CELL NEOPLASIA.
- NEGATIVE FOR MALIGNANCY.

Diagnoses (overview)

IHC for GCTs

ABCDs of GCTs:

  • AFP - yolk sac tumour.
  • Beta-hCG - choriocarcinoma.
  • CD30 - embryonal carcinoma.
  • D2-40 - seminoma.

Tabular summary of GCTs

Tumour Key feature Microscopic IHC Other Image
Intratubular germ cell neoplasia (ITGCN) nests of small fried egg cells large central nucleus, clear
cytoplasm, round or polygonal nuclear membrane, nucleoli[2] 		CD117 appearance similar to seminoma
 
ITGCN (WC)
Seminoma fried egg cells fried egg-like cells (central nucleus, clear
cytoplasm) with squared-off nuclear
membrane, nucleoli, lymphocytic infiltrate, granulomata,
syncytiotrophoblastic giant cells[3] 		D2-40 Dysgerminoma = female version of this tumour
 
Seminoma (WC)
Yolk sac tumour (endodermal sinus tumour) Schiller-Duval bodies Schiller-Duval b. = central blood vessel surrounded by epithelial-like cells a space and more epithelial-like cells, variable arch. AFP patterns: microcystic, solid, hepatoid
 
Yolk sac tumour (WC)
Embryonal carcinoma prominent nucleoli, vescicular nuclei var. arch.: tubulopapillary, glandular, solid, embryoid bodies (ball of cells in surrounded by empty space on three sides), +/-nuclear overlap, mitoses common CD30 usu. part of a mixed GCT
 
Embryonal carcinoma (WC)
Choriocarcinoma marked nuclear atypia cells with clear cytoplasm (cytotrophoblast), multinucleated cells (syncytiotrophoblast) beta-hCG not commonly pure, usu. a component of a mixed GCT
 
Choriocarcinoma (WC)
Teratoma skin, GI tract-like epithelium skin (epidermis, adnexal structures - sebaceous glands, hair follicles), GI tract-like glands (simple tall columnar epithelium), fat +/-primitive neuroepithelium (pseudostratified epithelium in rosettes) None testicular teratomas in post-pubertal males are all considered malignant[4]
 
Teratoma (WC)
Spermatocytic seminoma population of 3 cells pop.: (1) small cell with high NC ratio (mature lymphocyte-like), (2) medium with nucleoli, (3) large cells with filamentous chromatin - few present ? does not arise from ITGCN, no lymphocytic infiltrate (like in seminoma)
 
Spermatocytic seminoma (WC)
Mixed germ cell tumour NA common combinations: teratoma + embryonal carcinoma + endodermal sinus tumour (yolk sac tumour) (TEE); seminoma + embryonal (SE); embryonal + teratoma (TE) NA -
 
Mixed GCT (WC)

Tabular summary of (male) SCSTs

Tumour Key feature Microscopic IHC Other Image
Leydig cell tumour intersitial cell cluster with eosinophilic cytoplasm cytoplasmic vacuolization, uniform nuclei with nucleoli MART-1, calretinin, inhibin +/-Reinke crystals (cylindrical crystalloid eosinophilic cytoplasmic bodies)
 
Leydig cell tumour (WC)
Sertoli cell tumour cells in cords or trabeculae light staining bubbly cytoplasm +/- large cytoplasmic vacuoles, granular chromatin ? usu. no significant nuclear atypia, no mitoses
 
Sertoli cell tumour (WC)

Benign

Testicular atrophy

Cryptorchidism redirects here.
  • AKA atrophic testis.
  • AKA atrophy of the testis.

General

  • Microscopic appearance identical to cryptorchidism (undescended testis).[5]

Gross

  • Decreased size.

Microscopic

Features:[5]

  • Thickening of seminiferous tubule basement membrane.
  • Intertubular fibrosis.
  • Decreased sperm/no sperm present.

Note:

  • End-stage testicle - only has Sertoli cell within the seminiferous tubules.

Image:

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TESTICLE, RIGHT, ORCHIECTOMY:
- ATROPHIC TESTICLE.
- NEGATIVE FOR INTRATUBULAR GERM CELL NEOPLASIA.
- NEGATIVE FOR MALIGNANCY.

Micro

The sections show seminiferous tubules surrounded by thick hyaline sleeves. In a large number of sections only Sertoli cells are found in the tubules.

In some sections poorly defined paucicellular tubular structures reminiscent of seminiferous tubules composed of hyaline material are present; these probably represent obsolete seminiferous tubules. Focally, fibrosis is seen without definite tumour outlines. There is no significant inflammation. The rete testis is identified.

Rare seminiferous tubules have spermatid within. The germ cells seen do not have appreciable nuclear atypia.

Numerous small Leydig cell clusters are seen in some sections.

Spermatocele

General

  • Benign.
  • Cyst of the epididymis (classic).

Clinical:

  • Often asymptomatic.
  • Excised due to pain or mass effect.[7]

Microscopic

Features:

  • Cyst lined by a simple ciliated epithelium.
  • Contain sperm.
    • Head: ~1/2 the size of a RBC, black.
    • Tail: infrequently seen.

Note:

DDx:

Images

  • Spermatocele - intermed. mag. (WC)

  • Spermatocele - very high mag. (WC)

www:

Hydrocele testis

General

  • Benign.
    • May be seen in association with a testicular neoplasm.[9]
  • Common.[10]

Clinical:

  • Scrotal mass.

Microscopic

Features:

  • Cyst lined by a simple ciliated epithelium.
  • Does not contain sperm.

DDx:

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HYDROCELE SAC, LEFT, EXCISION:
- CONSISTENT WITH HYDROCELE SAC.

SOFT TISSUE ("HYDROCELE SAC"),LEFT, EXCISION:
- FIBROADIPOSE TISSUE COVERED BY MESOTHELIUM WITH REACTIVE CHANGES -- CONSISTENT
  WITH HYDROCELE SAC.
- EPIDIDYMIS WITH SPERM (INCIDENTAL FINDING).

Micro

The sections shows fragments of tissue compatible with a benign cyst, that had a fibrous wall and was lined by a simple epithelium. No spermatocytes are identified.

Benign connective tissue (including skeletal muscle, nerves and blood vessels) is also present.

Idiopathic granulomatous orchitis

Granulomatous orchitis redirects here.

General

  • Rare.
  • Unknown etiology -- possibly trauma + immune reaction to sperm.[11]

Microscopic

Features:[11]

  • Granulomas +/- necrosis.
  • +/-Destruction of seminiferous tubules.
  • Prominent collagen fibrosis.

DDx:

Stains

Premalignant

Intratubular germ cell neoplasia

  • Abbreviated ITGCN.
Main article: Intratubular germ cell neoplasia

Germ cell tumours

Main article: Germ cell tumours

Seminoma

Main article: Seminoma

Spermatocytic seminoma

Main article: Spermatocytic seminoma

Yolk sac tumour

Main article: Yolk sac tumour
  • Most common GCT in infants and young boys.

Microscopic

Classic feature:

  • Schiller-Duval bodies.
    • Look like glomerulus - central blood vessel surrounded by epithelial-like cells a space and more epithelial-like cells
  • Architecure - variable.
    • Most common microcystic pattern.[14]

Embryonal carcinoma

Main article: Embryonal carcinoma

These often look like a poorly differentiated carcinoma.

General

  • Affects young adults.
    • May be seen in women.

Microscopic

Features:[15]

  1. Nucleoli - key feature.
  2. Vesicular nuclei (clear, empty appearing nuclei) - key feature.
  3. Nuclei overlap.
  4. Necrosis - common.
    • Not commonly present in seminoma.
  5. Indistinct cell borders
  6. Mitoses - common.
  7. Variable architecture:
    • Tubulopapillary.
    • Glandular.
    • Solid.
    • Embryoid bodies - ball of cells in surrounded by empty space on three sides.

Notes:

  • Cytoplasmic staining variable (eosinophilic to basophilic).

Choriocarcinoma

Main article: Choriocarcinoma

These are aggressive tumours.

Microscopic

Features:

  • Syncytiotrophoblasts:
    • Large + many irreg. or lobular hyperchromatic nuclei.
    • Eosinophilic vacuolated cytoplasm (contains hCG).
  • Cytotrophoblasts:
    • Clear cytoplasm.
    • Polygonal shaped cells in cords/masses.
    • Distinct cell borders.
    • Single uniform nucleus.
  • +/-Hemorrhage.
  • +/-Necrosis.

Teratoma of the testis

Main article: Teratoma

In post-pubertal males these (testicular) tumours are considered malignant. They usually consist of all three germ layers.[16]

Sex cord stromal tumours

Leydig cell tumour

  • AKA interstitial cell tumour.
Main article: Leydig cell tumour

Sertoli cell nodule

  • Abbreviated SCN.
  • AKA Pick's adenoma.
  • AKA testicular tubular adenoma.
  • AKA tubular adenoma of the testis.

General

  • Benign proliferation of Sertoli cells - associated with cryptorchidism (undescended testis).
  • Not composed of a clonal cell population, i.e. not neoplastic; thus, technically, should not be called an adenoma.[17]

Gross

  • Usually an incidental finding, rarely presents as a testicular mass.[18]

Microscopic

Features:[17][19]

  • Unencapsulated nodules composed of well-formed tubules.
    • May contain eosinophilic (hyaline) blob in lumen (centre).
  • Cells - vaguely resemble immature Sertoli cells:
    • Bland hyperchromatic oval/round nuclei that are stratified.

DDx:[18]

Images

  • Sertoli cell nodule - high mag. (WC)

  • Sertoli cell nodule - low mag. (WC)

IHC

Features:[18]

  • Alpha-inhibin +ve (5/5 cases).
  • OCT3/4 -ve (5/5 cases).

Sertoli cell tumour

Main article: Sertoli cell tumour

Other

These tumours are rare.

Adenocarcinoma of the rete testis

General

  • Extremely rare - a few dozen cases in the world literature.[20]
  • Possible association of diethylstilbestrol.[20]

Microscopic

Features:

  • Adenocarcinoma:
    • Tubular or papillary architecture.[20]
    • Columnar cells with cigar-shaped nuclei.

Images

  • Adenocarcinoma of the rete testis - intermed. mag. (WC/Nephron)

  • Adenocarcinoma of the rete testis - high mag. (WC/Nephron)

See also

References

  1. ↑ Soper, MS.; Hastings, JR.; Cosmatos, HA.; Slezak, JM.; Wang, R.; Lodin, K. (Dec 2012). "Observation Versus Adjuvant Radiation or Chemotherapy in the Management of Stage I Seminoma: Clinical Outcomes and Prognostic Factors for Relapse in a Large US Cohort.". Am J Clin Oncol. doi:10.1097/COC.0b013e318277d839. PMID 23275274.
  2. ↑ Zhou, Ming; Magi-Galluzzi, Cristina (2006). Genitourinary Pathology: A Volume in Foundations in Diagnostic Pathology Series (1st ed.). Churchill Livingstone. pp. 538. ISBN 978-0443066771.
  3. ↑ Zhou, Ming; Magi-Galluzzi, Cristina (2006). Genitourinary Pathology: A Volume in Foundations in Diagnostic Pathology Series (1st ed.). Churchill Livingstone. pp. 542. ISBN 978-0443066771.
  4. ↑ Carver, BS.; Al-Ahmadie, H.; Sheinfeld, J. (May 2007). "Adult and pediatric testicular teratoma.". Urol Clin North Am 34 (2): 245-51; abstract x. doi:10.1016/j.ucl.2007.02.013. PMID 17484929.
  5. ↑ 5.0 5.1 Mitchell, Richard; Kumar, Vinay; Fausto, Nelson; Abbas, Abul K.; Aster, Jon (2011). Pocket Companion to Robbins & Cotran Pathologic Basis of Disease (8th ed.). Elsevier Saunders. pp. 506-7. ISBN 978-1416054542.
  6. ↑ URL: http://emedicine.medscape.com/article/443432-overview. Accessed on: 5 March 2012.
  7. ↑ Walsh, TJ.; Seeger, KT.; Turek, PJ.. "Spermatoceles in adults: when does size matter?". Arch Androl 53 (6): 345-8. PMID 18357964.
  8. ↑ Lane, Z.; Epstein, JI. (Jan 2010). "Small blue cells mimicking small cell carcinoma in spermatocele and hydrocele specimens: a report of 5 cases.". Hum Pathol 41 (1): 88-93. doi:10.1016/j.humpath.2009.06.018. PMID 19740515.
  9. ↑ Junnila, J.; Lassen, P. (Feb 1998). "Testicular masses.". Am Fam Physician 57 (4): 685-92. PMID 9490992.
  10. ↑ Wampler, SM.; Llanes, M. (Sep 2010). "Common scrotal and testicular problems.". Prim Care 37 (3): 613-26, x. doi:10.1016/j.pop.2010.04.009. PMID 20705202.
  11. ↑ 11.0 11.1 11.2 11.3 Roy, S.; Hooda, S.; Parwani, AV. (May 2011). "Idiopathic granulomatous orchitis.". Pathol Res Pract 207 (5): 275-8. doi:10.1016/j.prp.2011.02.005. PMID 21458170.
  12. ↑ Sekita, N.; Nishikawa, R.; Fujimura, M.; Sugano, I.; Mikami, K. (Jan 2012). "[Syphilitic orchitis: a case report].". Hinyokika Kiyo 58 (1): 53-5. PMID 22343746.
  13. ↑ Humphrey, Peter A; Dehner, Louis P; Pfeifer, John D (2008). The Washington Manual of Surgical Pathology (1st ed.). Lippincott Williams & Wilkins. pp. 364. ISBN 978-0781765275.
  14. ↑ URL: http://webpathology.com/image.asp?case=34&n=1. Accessed on: March 8, 2010.
  15. ↑ Zhou, Ming; Magi-Galluzzi, Cristina (2006). Genitourinary Pathology: A Volume in Foundations in Diagnostic Pathology Series (1st ed.). Churchill Livingstone. pp. 549. ISBN 978-0443066771.
  16. ↑ Moore, Keith L.; Persaud, T.V.N. (2002). The Developing Human: Clinically Oriented Embryology (7th ed.). Saunders. pp. 83. ISBN 978-0721694122.
  17. ↑ 17.0 17.1 Tadrous, Paul.J. Diagnostic Criteria Handbook in Histopathology: A Surgical Pathology Vade Mecum (1st ed.). Wiley. pp. 227. ISBN 978-0470519035.
  18. ↑ 18.0 18.1 18.2 Vallangeon, BD.; Eble, JN.; Ulbright, TM. (Dec 2010). "Macroscopic sertoli cell nodule: a study of 6 cases that presented as testicular masses.". Am J Surg Pathol 34 (12): 1874-80. doi:10.1097/PAS.0b013e3181fcab70. PMID 21107095.
  19. ↑ Ricco R, Bufo P (October 1980). "[Histologic study of 3 cases of so-called tubular adenoma of the testis]" (in Italian). Boll. Soc. Ital. Biol. Sper. 56 (20): 2110–5. PMID 6109541.
  20. ↑ 20.0 20.1 20.2 Newbold, RR.; Bullock, BC.; McLachlan, JA. (Dec 1986). "Adenocarcinoma of the rete testis. Diethylstilbestrol-induced lesions of the mouse rete testis.". Am J Pathol 125 (3): 625-8. PMC 1888460. PMID 3799821. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1888460/.

External links

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