halo sign of hydrops

ha·lo sign of hy·drops

a discredited radiographic sign of fetal hydrops caused by scalp edema so that a definite corona surrounds the skull.
Farlex Partner Medical Dictionary © Farlex 2012

halo sign of hydrops

(1) Halo sign, see there. 
(2) A corona-like finding seen by radiologic examination of a foetus, which was formerly regarded as characteristic of foetal hydrops.
Segen's Medical Dictionary. © 2012 Farlex, Inc. All rights reserved.