rocker bottom shadow

A horizontal, broad, curved soft tissue radiodensity that partially overlies the heart, extends into the hilum, corresponding to the thymus, seen in a plain AP chest film in neonatal pneumomediastinum, which derives its name from old wooden cradles
Segen's Medical Dictionary. © 2012 Farlex, Inc. All rights reserved.

rocker bottom shadow

Imaging A horizontal, broad, curved soft tissue radiodensity that partially overlies the heart, extends into the hilum, corresponding to the thymus, seen in a plain AP CXR in neonatal pneumomediastinum, and derives its name from old wooden cradles. See Spinnaker sail sign.
McGraw-Hill Concise Dictionary of Modern Medicine. © 2002 by The McGraw-Hill Companies, Inc.
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