When is A-scan ultrasonography indicated in the workup of choroidal melanoma?

Updated: Feb 18, 2020
  • Author: Enrique Garcia-Valenzuela, MD, PhD; Chief Editor: Andrew A Dahl, MD, FACS  more...
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A-scan ultrasonography of the eye is useful for tumors thicker than 2-3 mm

Choroidal melanoma characteristically shows an initial prominent spike, followed by low-to-medium internal reflectivity with diminishing amplitude and a significant echo

Vascular pulsations can be seen as fine oscillations of the internal spiking pattern within the tumor

Performing sequential A-scans, with accurate dimension measurements, in cases of diagnostic uncertainty is important

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