Atelectasis of which lobe is associated with the "S" sign of Golden?

Question

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The "S" sign of Golden is a radiographic finding in which the minor fissure is displaced downwards, forming a concavity or "S" shape. It is associated with atelectasis (collapse) of the right upper lobe, which causes the lower lobe to expand and pull the minor fissure downwards. This sign is most commonly seen in cases of bronchogenic carcinoma, tuberculosis, or post-obstructive pneumonia.

Atelectasis of Which Lobe Is Associated with the "S" Sign