Abstract
Diffuse uterine leiomyomatosis is a rare condition distinguished from the common uterine leiomyomata by involvement of the entire myometrium by innumerable, ill-defined, often small and confluent, histologically benign smooth-muscle nodules. Fourteen cases have been previously described in the literature. We report a case of diffuse leiomyomatosis in a 39-year-old woman. Several microscopic foci of the process were microdissected for clonality analysis. All samples showed a non-random X-chromosome inactivation pattern, and thus were consistent with a monoclonal neoplastic population of cells. However, in different foci of tumor, different X chromosomes were inactivated, supporting the independent origin of neoplastic clones and rejecting the possibility of a single clonal origin of all tumor cells. The results of the molecular analysis suggest that diffuse uterine leiomyomatosis may be an exuberant example of diffuse and uniform involvement of the entire myometrium by multiple leiomyomata. HUM PATHOL 31:1429-1432.
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