Short-term cultures of four abdominal smooth muscle tumors, three leiomyosarcomas and one leiomyoma, were analyzed cytogenetically. A low-grade malignant, epithelioid leiomyosarcoma had a normal karyotype. The other two leiomyosarcomas had abnormal karyotypes; one was near-diploid, and the other was near-triploid. Structural rearrangements of the short arm of chromosome 16 and monosomies of chromosomes 14, 15, and 22 were observed in both tumors. When our cases and previously published abdominal leiomyosarcomas are viewed in conjunction, loss of chromosomes 14, 15, and 22 are the most frequent abnormalities. The leiomyoma, the second cytogenetically abnormal nonuterine leiomyoma reported to date, had a hyperdiploid karyotype with a chromosome number of 56 and structural rearrangements of chromosomes 9, 14, and 19. The only aberrations similar to those observed in the previously reported esophageal leiomyoma were trisomies of chromosomes 7 and 8.
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