JOURNAL ARTICLE
RESEARCH SUPPORT, NON-U.S. GOV'T
REVIEW
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Histogenesis of cardiac myxomas. An immunohistochemical study of 19 cases, including one with glandular structures, and review of the literature.

To elucidate the histogenesis of cardiac myxomas, the literature has been reviewed, including all previous immunohistochemical studies, and an extensive immunohistochemical study of 19 cardiac myxomas has been undertaken with antibodies to factor VIII, desmin, vimentin, myoglobin, cytokeratin (CAM 5.2 and AE1/AE3), and S100 protein. In all cases, vimentin stained endothelial as well as "myxoma" (stromal) cells. In contrast, factor VIII only stained endothelial cells. In 16 cases, desmin stained cells in the vascular structures; in 5 cases, desmin stained myxoma cells. In 6 cases, S100 protein stained the myxoma cells strongly. Myoglobin was absent in all cases. In 1 case, CAM 5.2 and AE1/AE3 stained glandular structures. The results indicate the following: that most cardiac myxomas are true neoplasms derived from "embryonal rests"; that the various mesenchymal cells found in cardiac myxomas (myxoma cells, endothelial cells, smooth-muscle cells, fibroblasts, myofibroblasts, and chondroid cells), express differentiation, not histogenesis; that, apparently, only the myxoma cells are neoplastic; and that the glandular structures infrequently found in cardiac myxomas originate from entrapped foregut rests.

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