Seminoma
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Seminoma is a common testicular germ cell tumour.
| Seminoma | |
|---|---|
| Diagnosis in short | |
 Seminoma. H&E stain. | |
|
| |
| LM | fried egg-like cells (clear or eosinophilic cytoplasm, central nucleus), lymphocytic infiltrate (common), +/-syncytiotrophoblasts (rare), +/-granulomas (uncommon) |
| LM DDx | embryonal carcinoma, ITGCN, mixed germ cell tumour, granulomatous orchitis |
| IHC | OCT3 +ve, CD117 +ve, CD30 -ve |
| Gross | solid, white/tan |
| Site | testis |
|
| |
| Associated Dx | ITGCN |
| Signs | testicular mass, +/-retroperitoneal lymphadenopathy |
| Blood work | LDH elevated, beta-hCG elevated (not common) |
| Prognosis | good |
| Clin. DDx | other testicular tumours (germ cell tumours, lymphoma) |
It should not be confused with the unrelated tumour called spermatocytic seminoma.
General
- Male counterpart of the dysgerminoma, which arise in the ovary.
- Most common germ cell tumour of the testis.
Clinical:
- Elevated serum LDH.
- Normal serum alpha fetoprotein.
- Usually normal beta-hCG.
Note:
- Rarely, it may present a retroperitoneal mass.[1]
Epidemiology & etiology
- Arises from intratubular germ cell neoplasia (ITGCN).
Gross
- Solid, white/tan.
Seminoma (WC/Ed Uthman).
Microsopic
Features:
- Cells with fried egg appearance - key feature:
- Clear cytoplasm.
- Central nucleus, with prominent nucleolus.
- Nucleus may have "corners", i.e. it is not round.
- +/-Lymphoctyes - interspersed (very common).
- +/-Syncytiotrophoblasts, AKA syncytiotrophoblastic giant cells (STGCs),[2] present in ~10-20% of seminoma.[3]
- Large + irregular, vesicular nuclei.
- Eosinophilic vacuolated cytoplasm (contains hCG).
- Syncytiotrophoblasts = closest to mom in normal chorionic villi - covers cytotrophoblast.[4]
- +/-Florid granulomatous reaction.
Memory device: 3 Cs - clear cytoplasm, central nucleus, corners on the nuclear membrane.
DDx:
- Embryonal carcinoma.
- Solid variant of yolk sac tumour.
- Lacks fibrous septae and lymphocytes.[5]
- Mixed germ cell tumour.
- Choriocarcinoma - esp. if (multinucleated) syncytiotrophoblasts are present.[6]
- Granulomatous orchitis - if granulomas are present.
- Testicular scar - seminomas may regress spontaneously.
Images
Seminoma - high mag. (WC/Nephron)
Seminoma - intermed. mag. (WC/Nephron)
Seminoma in the rete testis. (WC/Nephron)
Seminoma with syncytiotrophoblasts - intermed. mag. (WC/Nephron)
Seminoma with syncytiotrophoblasts - very high mag. (WC/Nephron)
IHC
ISUP consensus paper by Ulbright et al.:[7]
- OCT4 +ve.
- Choriocarcinoma, yolk sac tumour and spermatocytic seminoma all -ve.
- CD117 +ve.
- -ve in embryonal carcinoma.
- CD30 -ve.
- +ve in embryonal carcinoma.
ISUP consensus for seminoma versus choriocarcinoma:[8]
- OCT4 (uniformily) +ve.
- Choriocarcinoma = patchy staining.
Additional notes:
- D2-40 +ve ~100% of cases in one series.[9]
- Useful for discriminating from embryonal carcinoma.[10]
- CD117 +ve (ckit) ~92% of cases.[9]
- CD30 -ve.[11]
- Done to r/o embryonal carcinoma.
- Cytokeratins usu. -ve, may have weak focal positivity.[11]
- OCT3/4 +ve.[12]
- Also +ve in embryonal carcinoma.[10]
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RETROPERITONEAL SOFT TISSUE, RIGHT, CORE BIOPSY: - SEMINOMA.
Micro
The sections show large atypical, discohesive cells with prominent nucleoli, central nuclei and moderate clear cytoplasm, intermixed with mature lymphocytes. Mitotic activity is present.
Small biopsy
A mixed germ cell tumour cannot be excluded; given the small quantity of tumour, this biopsy is at a high risk for having undersampled other tumour components should they be present. Correlation with serology and consideration of re-biopsy is suggested.
See also
References
- ↑ Preda, O.; Nicolae, A.; Loghin, A.; Borda, A.; Nogales, FF. (2011). "Retroperitoneal seminoma as a first manifestation of a partially regressed (burnt-out) testicular germ cell tumor.". Rom J Morphol Embryol 52 (1): 193-6. PMID 21424055.
- ↑ 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.
- ↑ URL: http://www.webpathology.com/image.asp?case=31&n=10. Accessed on: 22 May 2012.
- ↑ URL: http://upload.wikimedia.org/wikipedia/commons/4/45/Gray37.png. Accessed on: 31 May 2010.
- ↑ URL: http://webpathology.com/image.asp?case=34&n=8. Accessed on: March 8, 2010.
- ↑ Hedinger, C.; von Hochstetter, AR.; Egloff, B. (Jul 1979). "Seminoma with syncytiotrophoblastic giant cells. A special form of seminoma.". Virchows Arch A Pathol Anat Histol 383 (1): 59-67. PMID 157614.
- ↑ Ulbright TM, Tickoo SK, Berney DM, Srigley JR (August 2014). "Best practices recommendations in the application of immunohistochemistry in testicular tumors: report from the international society of urological pathology consensus conference". Am. J. Surg. Pathol. 38 (8): e50–9. doi:10.1097/PAS.0000000000000233. PMID 24832161.
- ↑ Amin, MB.; Epstein, JI.; Ulbright, TM.; Humphrey, PA.; Egevad, L.; Montironi, R.; Grignon, D.; Trpkov, K. et al. (Aug 2014). "Best practices recommendations in the application of immunohistochemistry in urologic pathology: report from the international society of urological pathology consensus conference.". Am J Surg Pathol 38 (8): 1017-22. doi:10.1097/PAS.0000000000000254. PMID 25025364.
- ↑ 9.0 9.1 Lau, SK.; Weiss, LM.; Chu, PG. (Mar 2007). "D2-40 immunohistochemistry in the differential diagnosis of seminoma and embryonal carcinoma: a comparative immunohistochemical study with KIT (CD117) and CD30.". Mod Pathol 20 (3): 320-5. doi:10.1038/modpathol.3800749. PMID 17277761.
- ↑ 10.0 10.1 Iczkowski, KA.; Butler, SL.; Shanks, JH.; Hossain, D.; Schall, A.; Meiers, I.; Zhou, M.; Torkko, KC. et al. (Feb 2008). "Trials of new germ cell immunohistochemical stains in 93 extragonadal and metastatic germ cell tumors.". Hum Pathol 39 (2): 275-81. doi:10.1016/j.humpath.2007.07.002. PMID 18045648.
- ↑ 11.0 11.1 Cossu-Rocca, P.; Jones, TD.; Roth, LM.; Eble, JN.; Zheng, W.; Karim, FW.; Cheng, L. (Aug 2006). "Cytokeratin and CD30 expression in dysgerminoma.". Hum Pathol 37 (8): 1015-21. doi:10.1016/j.humpath.2006.02.018. PMID 16867864.
- ↑ Emerson, RE.; Ulbright, TM. (Jun 2010). "Intratubular germ cell neoplasia of the testis and its associated cancers: the use of novel biomarkers.". Pathology 42 (4): 344-55. doi:10.3109/00313021003767355. PMID 20438407.
