1990 Volume 32 Issue 11 Pages 2562-2569
We studied to differentiate leiomyosarcoma from leiomyoma, under 5.0 cm in diame-ter, by estimating the irregularity of marginal echo (IRM), the irregularity of internal echo (IRI), low echo area (LEA) and lobulation (LOB) on EUS findings. These four findings were characteristic of myogenic tumor, over 5.0 cm in diameter. And in three cases of leiomyosarcoma, under 5.0 cm in diameter, appearance of these four findings was as followed : IRM showed in 3 cases, IRI, 2 cases, LEA, 1 case and lobulation, 2 cases. On the other hand, in five cases of leiomyoma, each of these four findings appeared in only 1 case. On the basis of comparative study between EUS and pathological findings, the irregularity of marginal echo showed the external margin of lobuli in 4 cases, and low echo area showed the necrotic tissues in all cases. As a result, these four findings appeared to be more popular in cases of leiomyosarcoma than in cases of leiomyoma. On EUS examination, it was important to evaluate these four findings.
