Answer: Jellyfish signs refer to an atelectatic lung that appears to be swimming within pleural effusion. This implies that the lung is neither consolidated nor adhered to pleura. It also implies that pleural effusion is probably a transudative as low viscosity of the fluid allows 'swimming' of the lung.
You may see a video here:
https://www.youtube.com/shorts/fx6rBMv6Gfc
#pulmonary
#ultrasound
References:
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
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
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