SOLITARY FIBROUS TUMOR OF THE ADRENAL-GLAND

Solitary fibrous tumors are rare neoplasms, most commonly involving th e pleura, recently described in various other locations. We report a s olitary fibrous tumor of the right adrenal gland in a 42-year-old woma n, discovered incidentally during abdominopelvic ultrasonographic exam ination. Pathologic and immunohistologic features of the tumor were id entical to those of other solitary fibrous tumors. Three-quarters of t his unencapsulated infiltrating tumoral mass presented foci of hemorrh age and were made of small, round, epithelioid-like cells that express ed the CD34 antigen more weakly than do the typical spindle cells usua lly observed in solitary fibrous tumors. Despite hemorrhage and poor l imitation, the tumor behaved in a innocuous manner; the mass remaining unchanged for more than 5 years before the patient agreed to surgical intervention, which was recommended because of a sudden enlargement o f the mass.