The sonomammographic (SM) criteria of sixty histologically proven brea
st fibroadenomas (FA) were studied. Most of the lesions demonstrated s
harp wall contours (98.3%), while 95% were deformable under the effect
of compression. Over 88% of them were hypoechoic and almost 82% had h
omogenous echo pattern. The study showed that the accuracy of SM for t
he diagnosis of FA was 91.7%, that of X-ray mammography (XM) was 75.8%
while clinical examination was 33.3%. It is concluded that the most i
mportant diagnostic criteria are the state of the sharp wall contour a
nd a positive compression effect. Sonomammography is an extremely impo
rtant diagnostic tool in the diagnosis of breast FA.