The clinical and pathological features of four cases of the rare entit
y diffuse leiomyomatosis of the uterus are described. The patients, wh
o ranged in age from 28 to 35 years, presented with a six month to ten
year history of abnormal uterine bleeding, dysmenorrhoea and an enlar
ged uterus. Hysterectomy in each case revealed a symmetrically enlarge
d uterus containing numerous small ill-defined leiomyomatous nodules,
On microscopic examination the nodules were composed of compact fascic
les and interweaving bundles of plump uniform benign smooth muscle cel
ls. The nodules blended with each other and merged imperceptibly with
the surrounding less cellular normal myometrium. The four patients are
alive and well without further treatment. The follow-up period ranged
from six months to twelve years.