Dysgerminoma

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Dysgerminoma
Classification and external resources
Seminoma high mag.jpg
Micrograph a seminoma, a tumour that is histologically indistinguishable from a dysgerminoma. H&E stain.
ICD-9 183.0
ICD-O: 9060/3
MeSH D004407

A dysgerminoma is a type of germ cell tumor;[1] it usually is malignant and usually occurs in the ovary.

A tumor of the identical histology but not occurring in the ovary may be described by an alternate name: seminoma in the testis[2] or germinoma in the central nervous system or other parts of the body.

Dysgerminoma accounts for less than 1% of ovarian tumors overall. Dysgerminoma usually occurs in adolescence and early adult life; about 5% occur in pre-pubertal children. Dysgerminoma is extremely rare after age 50. Dysgerminoma occurs in both ovaries in 10% of patients and, in a further 10%, there is microscopic tumor in the other ovary.

Abnormal gonads (due to gonadal dysgenesis and androgen insensitivity syndrome) have a high risk[3] of developing a dysgerminoma. Most dysgerminomas are associated with elevated serum lactic dehydrogenase (LDH), which is sometimes used as a tumor marker.

Presentation[edit]

They are exceptionally associated with hypercalcemia. On gross examination, dysgerminomas present with a smooth, bosselated (knobby) external surface, and is soft, fleshy and either cream-coloured, gray, pink or tan when cut. Microscopic examination typically reveals uniform cells that resemble primordial germ cells. Typically, the stroma contains lymphocytes and about 20% of patients have sarcoid-like granulomas.

Metastases are most often present in the lymph nodes.

Treatment[edit]

Dysgerminomas, like other seminomatous germ cell tumors, are very sensitive to both chemotherapy and radiotherapy. For this reason, with treatment patients' chances of long term survival, even cure, is excellent[citation needed].

References[edit]

  1. ^ Behtash N, Karimi Zarchi M (2007). "Dysgerminoma in three patients with Swyer syndrome". World J Surg Oncol 5 (1): 71. doi:10.1186/1477-7819-5-71. PMC 1934908. PMID 17587461. 
  2. ^ "dysgerminoma" at Dorland's Medical Dictionary
  3. ^ Nelson Textbook of Pediatrics, 18th ed. Chapter 553. Question 11, Gynecologic Problems of Childhood