Germ cell tumours

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This article covers germ cell tumours, often abbreviated GCT, which classically arise in the gonads (ovary, testis). They are also found in the midline and make appearances in neuropathology (e.g. pineal gland) and in the mediastinum.

Overview

Germ cell tumour - types

Precusor:

Germ cell tumours (GCTs):

Grossing

  • 1 cm^2 of tumour per cm of maximal tumour dimension - guideline for testicular cancer.[1]

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, squared-off nuclear membrane, nucleoli[2]
CD117 appearance similar to seminoma
 
ITGCN (WC/Nephron)
Germinoma / Seminoma / Dysgerminoma 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 seminoma = male version of this tumour; dysgerminoma = female version of this tumour
 
Seminoma (WC/Nephron)
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/Nephron)
Choriocarcinoma clear cytoplasm cells with abundant clear cytoplasm and eccentric atypical nuclei (cytotrophoblast), very large (multinucleated) cells with abundant eosinophilic cytoplasm and extreme nuclear atypia (syncytiotrophoblast) beta-hCG may be preceded by a complete hydatidiform mole
 
Choriocarcinoma. (WC/Nephron)
Teratoma, immature primitive neuroepithelium pseudostratified epithelium in rosettes (gland-like arrangement) None teratoma are always malignant in males
 
Primitive neuroepithelium (WC/Nephron)
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/Nephron)
Gonadoblastoma primitive germ cells (central nucleus, moderate (eosinophilic) cytoplasm); sex cord element sex cord element may be either granulosa cells (follicle-like arch.) or Sertoli cells (trabecular arch.) ? often abnormal karyotype; usu. Y chromosome present [[Image:Gonadoblastoma_-_intermed_mag.jpg|thumb|center|150px|Gonadoblastoma (WC/Nephron)]

Molecular pathology

Most common cytogenetic abnormality in GCTs:

  • Isochromosome p12.[4]
    • Isochromosome = one arm (p or q) is lost and replaced with a duplicate of the remaining one.
      • Example: isochromosome p12 = chromosome 12 where q is lost and two p arms are present.[5]

Germinoma

Comes in three flavours:

  • Germinoma.
  • Seminoma.
  • Dysgerminoma.

Germinoma

Is the generic version of this tumour. It is found in the midline (brain, mediastinum).

Image: Germinoma (upmc.edu).[6]

Seminoma

A common GCT in males.

Dysgerminoma

A common GCT in females.

Yolk sac tumour

  • Abbreviated YST.
  • AKA endodermal sinus tumour.

General

  • Rare.
  • Aggressive - especially extragonadal tumours.[7]

Epidemiology:

  • Most common GCT in infants and young boys.
  • Bimodal age distribution:[7]
    • <4 years.
    • 10-30 years.

Clinical:

  • Elevated AFP.

Gross

  • White/yellow mucinous infiltrative mass.[8]

Microscopic

Classic feature:[8]

  • Schiller-Duval bodies.
    • Look like glomerulus - central blood vessel surrounded by epithelial-like cells a space and more epithelial-like cells
  • Architecure - variable.
    1. Reticular - most common according to WMSP.[9]
    2. Microcystic - most common according to webpathology.com.[10]
      • Lace-like pattern.
    3. Endodermal sinus-like - has Schiller-Duval bodies.
    4. Solid.
    5. Papillary.
    6. Glandular.
    7. Alveolar.
    8. Enteric.
    9. Polyvesicular vitelline.
    10. Hepatoid.
  • +/-Eosinophilic hyaline globules (contain alpha-fetoprotein).

Notes:

  • Has a loose stroma/vaguely discohesive -- unlike embryonal carcinoma.
  • How to remember patterns REM PS GAPEH = reticular, endodermal sinus, microcystic, papillary, solid, glandular, alveolar, polyvesicular vitelline, enteric, hepatoid.
  • Yolk sac tumours in adults are essentially always a component of a mixed germ cell tumour, i.e. if one sees a pure yolk sac tumour in an adult, it is probably under sampled.[11]

Variants:

  • Hepatoid pattern.[12]
    • Vaguely resembles liver.
  • Solid pattern.[13]
    • Vaguely resembles seminoma.

DDx:

Images

www:

IHC

  • AFP +ve.
  • Glypican 3 +ve.
    • More sensitive than AFP.[15]
  • Alpha-1 AT +ve.
  • Cytokeratin +ve.[citation needed]

Negative stains:[16]

Embryonal carcinoma

General

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

Microscopic

Features:[17]

  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).

DDx:

Images

IHC

  • AE1/AE3 +ve.
  • CD30 +ve.

Choriocarcinoma

General

  • Aggressive clinical course.
  • Usually a mixed tumour, i.e. pure choriocarcinoma is rare, e.g. dysgerminoma + choriocarcinoma.

Clinical

  • High beta-hCG -- usually > 10,000 IU.
  • Vaginal bleeding.
  • Occasionally thyrotoxicosis.[18]

Epidemiology

Microscopic

Features:

  • Two cell populations:
  1. Cytotrophoblasts - key feature.
    • Clear cytoplasm.
    • Polygonal shaped cells in cords/masses.
    • Distinct cell borders.
    • Single uniform nucleus.
  2. Syncytiotrophoblasts - may be absent.[20]
    • Large + many irreg. or lobular hyperchromatic nuclei.
    • Eosinophilic vacuolated cytoplasm (contains hCG).
  • +/-Hemorrhage - classically in the centre of the lesion.
  • +/-Necrosis.

Notes:

  • No chorionic villi should be present.
  • The dual cell population may not be evident at first.
    • Hemorrhage and marked nuclear pleomorphism are suggestive of the diagnosis.

DDx:

Images

www:

IHC

  • Beta-hCG +ve.
    • Classically said to be produced by syncytiotrophoblasts.[22]
      • Cytotrophoblasts also produce some[22][23] - usu. no staining.
  • MUC-4 +ve.[24]
  • Ki-67 +ve -- typically >30%.

Teratoma

General

  • May be benign or malignant.
  • Are supposed to consists of all three germ layers - this is not always true.
  • May be associated with sacral agenesis.[25]

Important note:

  • The site of the tumour, age and sex are very important for predicting the behaviour of a teratoma:[26]
    • Immature teratomas may have a benign or malignant behaviour.
    • Mature teratomas may have a benign or malignant behaviour.

Classification

  1. Mature.
    • Common in females.
    • Usually benign.
    • Mature component may give rise to a malignancy like elsewhere in the body.
  2. Immature.
    • Uncommon.
    • Often malignant.
  3. Monodermal.
    • Rare.
    • Highly specialized.

Mature teratoma

Features - three germ cell layers (usually):[27]

  1. Endoderm:
    • Skin, (mature) CNS.
  2. Mesoderm:
    • Muscle, bone, connective tissue, blood.
  3. Ectoderm:
    • Internal organs.

Note:

  • May consist of skin only - in which case it is commonly called a dermoid.
Images

Fetus in fetu

  • Grouped with mature teratoma, as it is considered a well-developed mature teratoma.[28][29]
    • It has been suggested they are distinct from teratomas.[30]
      • They could be thought of as a parasitic twin.

Features:

  • Discrete mass consisting of mature tissues that form well-developed structures with the normal anatomical relations.
    • Separated from teratoma by the presence of a vertebral column.[31]

Immature teratoma

Features:

  • Immature if neural tissue is present:[32]
    • Vaguely resembles pseudostratified respiratory epithelium.
  • Islands of small hyperchromatic cells - "blastema".
  • +/-Cartilage.
  • +/-Adipocytes.
  • +/-Colonic type mucosa.
  • +/-Stratified squamous epithelium (skin).

DDx:[33]

Images

Other images:

Grading (immature)

Based on quantity of immature neuroepithelium:[34][35][36]

  • G0 - mature teratoma; no immature neuroepithelium.
  • G1 - less than one lower power field (LPF) of immature neuroepithelium; LPF defined field at 4X magnification.
  • G2 - 1-3 LPFs.
  • G3 - more than 3 LPFs.

Note:

  • LPF not adequately defined - see LPFitis. Same BS as HPF.

IHC (immature)

Features:

  • Primitive neuroepithelium:[37]
    • Neuron-specific enolase (NSE) +ve.
    • Neuron-specific B tubulin +ve.
    • Synaptophysin +ve.

Monodermal teratomas

Struma ovarii

Features:

Images

Strumal carcinoid

Features:[38][39]

  • Has components that suggest:
    1. Carcinoid (neuroendocrine tumour).
      • Nuclei with stippled chromatin (salt-and-pepper chromatin).
    2. Thyroid - cystic spaces/follicular-like structures.
Images

Gonadoblastoma

General

  • Associated with abnormal sexual development.
  • Often coexist with a dysgerminoma.
  • A mixed tumour that consists of (1) primitive germ cells and (2) sex cord elements.

Gross

  • +/-Cystic.

Microscopic

Features:[40]

  • Immature germ cells resembling Sertoli cells or granulosa cells.
    • Sertoli cells = moderate cytoplasm in a trabecular or tubular architecture.
    • Granulosa cells = form follicle-like structures.
      • May form nests.
  • Primitive germ cells resemble those of a dysgerminoma.
    • Polygonal cells with a central nucleus, squared-off nuclear membrane and clear cytoplasm.
  • +/-Calcification (very common).
  • +/-Eosinophilic basement membrane material between the (primitive) germ cells and support cells.[41]

Images

www:

Polyembryoma

General

Microscopic

Features:

  • Disc shaped structure (embryo-like) with:
    • The one side endoderm.
      • Skin/CNS.
    • The other side ectoderm.
      • Internal organs - GI tract.

Images:

Mixed germ cell tumour

General

  • 60% of GCTs are mixed.

Common combinations:

  1. Teratoma + embryonal carcinoma + endodermal sinus tumour (yolk sac tumour) (TEE).
  2. Seminoma + embryonal (SE).
  3. Teratoma + embryonal +(TE).

Memory device: TEE + all combinations have embryonal carcinoma.

Microscopic

Features:

  • Depends on components.

Notes:

  • If one cannot identify the component... it is probably yolk sac as this has so many different patterns.

Images

www:

IHC

  • Beta-hCG +ve - if syncytiotrophoblasts are present.
  • AFP +ve - a yolk sac tumour component is present.
  • GFAP +ve - if neuroepithelium is present.

See also

References

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