Abstract
Striated muscle does not often give rise to tumor. Neoplasms containing this tissue are chiefly observed within the kidneys and male gonads. While the kidneys and testes do not normally contain striated muscle fibers, embryonal muscular elements may become misplaced into the anlagen of these organs because of their proximity to the myotome during early evolution. The frequent association of rhabdomyomata of the heart with developmental anomalies suggests that, in these tumors as well, an abnormal histogenetic development may play a rôle.

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