Difference between revisions of "Spermatocytic tumour"

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| Width      =
| Width      =
| Caption    = Spermatocytic tumour
| Caption    = Spermatocytic tumour
| Synonyms  = spermatocytic seminoma (old term)
| Micro      = three cell populations: (1) small cells (6-8 µm) - with a large NC ratio, (2) medium cells (15-18 µm) with prominent nucleoli and spireme chromatin, (3) Large cells (50-100 µm) with spireme chromatin; mucoid lakes, intratubular spread
| Micro      = three cell populations: (1) small cells (6-8 µm) - with a large NC ratio, (2) medium cells (15-18 µm) with prominent nucleoli and spireme chromatin, (3) Large cells (50-100 µm) with spireme chromatin; mucoid lakes, intratubular spread
| Subtypes  =
| Subtypes  =
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| Other      =
| Other      =
| ClinDDx    = other [[germ cell tumours]], [[lymphoma]]
| ClinDDx    = other [[germ cell tumours]], [[lymphoma]]
| Tx        = excision to exclude malignancy
}}
}}
'''Spermatocytic tumour''' is a rare benign testicular tumour.  
'''Spermatocytic tumour''' is a rare benign testicular tumour.  
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===Epidemiology===
===Epidemiology===
*Does ''not'' arise from ''[[germ cell neoplasia in situ]]'' (previously known as ''intratubular germ cell neoplasia'').<ref name=pmid3583416>{{cite journal |author=Müller J, Skakkebaek NE, Parkinson MC |title=The spermatocytic seminoma: views on pathogenesis |journal=Int. J. Androl. |volume=10 |issue=1 |pages=147–56 |year=1987 |month=February |pmid=3583416 |doi= 10.1111/j.1365-2605.1987.tb00176.x|url=}}</ref> - '''not''' considered a subtype of [[seminoma]].
*Does ''not'' arise from ''[[germ cell neoplasia in situ]]'' (previously known as ''intratubular germ cell neoplasia'')<ref name=pmid3583416>{{cite journal |author=Müller J, Skakkebaek NE, Parkinson MC |title=The spermatocytic seminoma: views on pathogenesis |journal=Int. J. Androl. |volume=10 |issue=1 |pages=147–56 |year=1987 |month=February |pmid=3583416 |doi= 10.1111/j.1365-2605.1987.tb00176.x|url=}}</ref> - '''not''' considered a subtype of [[seminoma]].


==Microscopic==
==Microscopic==
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Image:Spermatocytic_seminoma_high_mag.jpg | Spermatocytic tumour - high mag. (WC)
Image:Spermatocytic_seminoma_high_mag.jpg | Spermatocytic tumour - high mag. (WC)
Image:Spermatocytic_seminoma_intermed_mag.jpg | Spermatocytic tumour - intermed. mag. (WC)
Image:Spermatocytic_seminoma_intermed_mag.jpg | Spermatocytic tumour - intermed. mag. (WC)
Image:testicular spermatocytic tumour high mag.jpg | Spermatocytic tumour - high mag. (WC)
</gallery>
</gallery>


Revision as of 16:18, 30 September 2018

Spermatocytic tumour
Diagnosis in short

Spermatocytic tumour
Synonyms spermatocytic seminoma (old term)
LM three cell populations: (1) small cells (6-8 µm) - with a large NC ratio, (2) medium cells (15-18 µm) with prominent nucleoli and spireme chromatin, (3) Large cells (50-100 µm) with spireme chromatin; mucoid lakes, intratubular spread
LM DDx DLBCL, seminoma
Site testis
Signs mass lesion
Prevalence rare
Prognosis benign, good
Clin. DDx other germ cell tumours, lymphoma
Treatment excision to exclude malignancy

Spermatocytic tumour is a rare benign testicular tumour.

It was previously known as spermatocytic seminoma. It should not be confused with seminoma which is an unrelated tumour.

General

  • Rare tumour.
  • Only one case of metastases in 200 cases.[1]
  • Orchiectomy is curative.
  • Not reported/found in females.[1]
  • Typically older - mean age 50s.[1]

Epidemiology

Microscopic

Features:[3]

  • Population of three cells.
    1. Small cells (6-8 µm) - with a large NC ratio.
      • Look like secondary spermatocytes.
      • May be confused with (mature) lymphocytes.
    2. Medium cells (15-18 µm) with prominent nucleoli.
      • Filamentous chromatin (AKA spireme chromatin).[1]
    3. Large cells (50-100 µm).
      • Filamentous chromatin.
  • Mucoid lakes.
  • Intratubular spread.

Notes:

  • Spireme = the tangle of filaments in prophase portion of mitosis.[4]
  • May have eosinophilic cytoplasm (dependent on lab).

DDx:

Images

  • Spermatocytic tumour - high mag. (WC)

  • Spermatocytic tumour - intermed. mag. (WC)

  • Spermatocytic tumour - high mag. (WC)

IHC

Features:[5]

  • PLAP -ve (0 positive/17).
  • CD117 -ve (7 positive/17).
  • CAM5.2 -ve (1 positive/17).

See also

References

  1. ↑ 1.0 1.1 1.2 1.3 Eble JN (October 1994). "Spermatocytic seminoma". Hum. Pathol. 25 (10): 1035–42. PMID 7927308.
  2. ↑ Müller J, Skakkebaek NE, Parkinson MC (February 1987). "The spermatocytic seminoma: views on pathogenesis". Int. J. Androl. 10 (1): 147–56. doi:10.1111/j.1365-2605.1987.tb00176.x. PMID 3583416.
  3. ↑ Cotran, Ramzi S.; Kumar, Vinay; Fausto, Nelson; Nelso Fausto; Robbins, Stanley L.; Abbas, Abul K. (2005). Robbins and Cotran pathologic basis of disease (7th ed.). St. Louis, Mo: Elsevier Saunders. ISBN 0-7216-0187-1.
  4. ↑ URL: http://www.thefreedictionary.com/spireme. Accessed on: 4 June 2010.
  5. ↑ Kraggerud, SM.; Berner, A.; Bryne, M.; Pettersen, EO.; Fossa, SD. (Mar 1999). "Spermatocytic seminoma as compared to classical seminoma: an immunohistochemical and DNA flow cytometric study.". APMIS 107 (3): 297-302. PMID 10223302.
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