American Journal of Roentgenology, Vol 168, 1595-1598, Copyright © 1997 by American Roentgen Ray Society
Ruptured or intact: what can linear echoes within silicone breast implants tell us?
LU Palmon, MC Foshager, H Parantainen, LI Everson and B Cunningham
Department of Radiology, University of Minnesota Hospital and Clinic, Minneapolis, MN 55455, USA.
OBJECTIVE: During sonographic evaluation of silicone breast implants for
possible rupture, we have frequently encountered several patterns of linear
echoes within the implants. To our knowledge, the significance of this
finding has not been established in the literature. The purpose of this
study was to determine whether internal echoes are significant in
predicting implant rupture. SUBJECTS AND METHODS: Thirty-three patients
with 64 silicone implants were prospectively entered into a study that
included gray-scale sonography of the implants and subsequent surgical
removal. Echo patterns within the implants were retrospectively evaluated
on hard-copy films and compared with the integrity of the implant at
surgery. RESULTS: Three categories of internal echo patterns were
identified: "thick linear echoes." "thin linear echoes," and "commas." One
or more of these echo patterns were seen in 57 (89%) of the 64 implants.
Thick linear echoes were seen in 23 (36%) of the 64 implants, thin linear
echoes were seen in 33 (52%) of the 64 implants, and commas were seen in 47
(73%) of the 64 implants. All echo patterns were seen in intact and
ruptured implants with nearly equal frequency. We found no statistical
significance for any echo pattern in predicting whether an implant was
ruptured or intact. Of the 64 implants, four were entirely free of internal
echoes. All four implants were intact. CONCLUSION: A variety of linear
echoes can be seen in most silicone breast implants on gray- scale
sonography. The presence or absence of linear echoes is not useful in
predicting implant rupture. Complete absence of internal echoes, while
highly predictive of an intact implant, is infrequently seen.