Congenital Teratoma (Extragonadal teratoma)

General: The most common congenital tumor. Although associated with foci of conventional yolk sac tumor (YST), it's presence or absence does not correlate with prognosis; the predominant factor of prognostic significance is whether or not it is completely resected, and presentation prior to 30wks gestation (Congenital Teratoma. Heerema-McKenney, Am J Surg Path 2005;29;29-38).

Gross: Usually large (~10cm), with a variably soft and fibrotic pale cut surface and cystic areas. Most are sacrococcygeal.

Microscopic: Composed of a wide variety of maturing (consistent with age) and immature tissues in a myxoid stroma. Neuroepithelium, endodermal glands (enteric or respiratory), and liver are generally the most common.

Differential Diagnosis:

Stains:

• Positive:
• Negative:
• Suggested, focused panel:

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Images:


Cases:

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