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Updated: Aug 14, 2026

Fate Mapping of Human Embryonic Stem Cells by Teratoma Formation
Published on: August 1, 2010
Immature teratoma arising from a benign cortical abnormality
Case Report:
The authors report the case of an immature teratoma of the left parieto-occipital region in a 13-year-old girl. The patient had a computed tomographic (CT) scan of the brain aged 10 months old, following a minor head injury. This demonstrated an abnormality in the same region, which had been reported as 'a cortical malformation'.
Diagnosis:
We propose that the lesion on the original imaging is a mature teratoma or other silent dystopic germ cell element that subsequently transformed into the immature teratoma.
Discussion:
The potential triggers for such a transformation and the management of patients with similar incidental radiological findings are discussed.
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