Golden S sign

In radiology, the Golden S sign, also known as the S sign of Golden, is a radiologic sign seen on chest X-ray that suggests a central lung mass or a lung collapse.^[1] It was first described by, and subsequently named after, Dr Ross Golden (1889–1975) in 1925 in association with bronchial carcinoma,^[2] but it is also seen in metastatic cancer, enlarged lymph nodes, and collapse of the right upper lobe of the lung.^[1]

The Golden S sign can be seen on plain radiographs as well as on computed tomography (CT) scans of the chest.^[1][3] The sign is seen in the right lung as a distorted minor fissure, whose lateral aspect is concave inferiorly and whose medial aspect is convex inferiorly.^[1] This produces a "reverse S" appearance, responsible for the sign being occasionally called the reverse S sign of Golden.^[1]