Jellyfish sign (ultrasound)
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.
- 1. Han J, Xiang H, Ridley WE, Ridley LJ. Jellyfish sign: Pleural effusion. (2018) Journal of medical imaging and radiation oncology. 62 Suppl 1: 33. doi:10.1111/1754-9485.20_12785 - Pubmed
- 2. Francisco MJ, Rahal A, Vieira FA, Silva PS, Funari MB. Advances in lung ultrasound. (2016) Einstein (Sao Paulo, Brazil). 14 (3): 443-448. doi:10.1590/S1679-45082016MD3557 - Pubmed