Abstract

blood count, 13,500, with 65% lymphocytes, 20% polymorphonu cleocytes, 2% bands, 2% metamyelocytes, 2% monoeytes, and 6% eosinophils. Serum concentrations of calcium and phosphorus were normal. The urine spot examination for VMA was 15/~g/mg creatinine. The chest roentgenogram showed a posterior superior mediasfinal mass separate from a normal thymic shadow. Results of an WP, bone survey, and Gallium scan were normal. At thoracotomy a 3 • 5 • 2 cm mass resembling normal thymic tissue was located posterior to the superior vena cava lying along the right side of the trachea. After a normal thymus gland was identified in its usual location, the mass was removed. Histologic examination revealed thymic tissue in involution.

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