A giant, well-differentiated papillary mesothelioma of the left atrioventricular groove: Case report and brief review of the literature.

Of the primary cardiac tumors, well-differentiated papillary mesothelioma (WDPM) is very rare, with only one case report documenting WDPM of the pericardium. We report herein a 17-year-old boy who had an abnormal chest X-ray on a routine college-entrance examination. A giant cardiac tumor was detected by echocardiography. The neoplasm was partially resected, and histopathological examination revealed a WDPM. The patient recovered without any complication.