Pure mesenchymal neoplasms of the uterine corpus: selected problems.

The first part of this review includes a discussion of some issues in decision analysis as it applies to uterine mesenchymal tumors, as well as a discussion of some of the morphologic features and histochemical techniques that may be used to determine whether a mesenchymal tumor is demonstrating smooth muscle or endometrial stromal differentiation. Also included in the first part are caveats that the pathologist should observe before interpreting mesenchymal tumors of the uterus. The second part of the paper is devoted to morphologic diagnostic criteria and differential diagnosis.