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Impressum
Detection and localisation of foramina in retinal surgery by means of 20 MHz-sonography
Schmidt W.
Zentrum für Augenheilkunde, Friedrichstraße 18, D-35392 Gießen
Introduction: We investigated whether high frequence sonography
is a tool for detection and localisation of foramina previous to surgery
of rhegmatogenous retinal detachment when visual examination of the periphery
of the retina is difficult.
Patients and methods: Our study was performed with the I3 sonographic
system. 16 patients had preoperative ultrasonic examination in the 10
MHz as well as in the 20 MHz mode. The 10 MHz examination was performed
transpalpebrally, for the 20 MHz examination topical anaesthesia of the
cornea, Methocel® and Sonogel® was used.
Results: By means of the 10 MHz-examination 5 of 14 foramina detected
by visual examination could be proved sonographically too. On the other
hand 13 of 14 foramina were detected using 20 MHz-sonography. By means
of 10 MHz-examination no further foramina were detected in the 16 eyes.
On the other hand in 5 of 16 eyes additional foramina were proved by 20
MHz-examination. Vitreous adhesions were detected in 1 of 16 eyes by 10
MHz, in 9 of 16 eyes by 20 MHz.
Conclusion: By means of high frequence sonography the detection
of foramina in rhegmatogenous retinal detachment is more sensitive compared
with 10 MHz-sonography. In some cases additional foramina which could
not be detected by visual examination can be proved by high frequence
sonography which makes it easier for the retinal surgeon to applicate
a cerclage additionally. In those cases with simultaneous detection of
limbus and foramen in one frame the position of the foramen relative to
the limbus can be specified quantitatively.