Shades of Grey

ANSWER: The Curtain Sign.

This is created by a fully expanded lung, covering the lateral aspect of the diaphragm as the person breathes, much likened to a curtain being drawn back and forth. When demonstrated at the most dependent part of the lower chest, a pleural effusion or pathology at the lateral lung base can be excluded.

CONTRIBUTOR:

Dr. Francis Lee Chun Yue

Acute and Emergency Care Centre, Khoo Teck Puat Hospital. Singapore

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