Seashore sign is another eFAST finding usually in the lungs in the M-mode that depicts the glandular echogenicity of the lung abutted by the linear appearance of the visceral pleura. This sign is a normal finding.
Seashore sign, a finding on eFAST imaging of the lungs in M-mode, is characterized by its glandular echogenicity (the way sound waves reflect off tissues) and the linear appearance of the visceral pleura (the lining of the lung). This sign is considered normal.