Cystic tumors of the atrioventricular node appear to be identical to solid cell nests of the thyroid, suggesting they represent ultimobranchial heterotopia related to cardiac neural crest cell development.
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Recognizing CTAVN-SCN identity may aid pathologic diagnosis; leaves open embryologic origins and validation needs.
Cameselle‐Teijeiro et al. (2005) studied this question.
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