Jellyfish sign (ultrasound)

Last revised by Chris Lim on 18 Jun 2020

The jellyfish sign refers to the sonographic appearance of atelectatic lung "swimming" within a large pleural effusion. The mobility of the lung within pleural fluid implies an absence of lung consolidation and the absence of pleural adhesions 1. It is also suggestive of a transudative pleural effusion, as the viscosity of more exudative effusions may hamper free lung excursion 2.

ADVERTISEMENT: Supporters see fewer/no ads

Cases and figures

  • Case 1: sonographic pleural effusion
    Drag here to reorder.
  • Case 2: Jellyfish sign
    Drag here to reorder.