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FIG 2. A, In normal position, beam hardening completely obscures pretracheal soft tissues (open arrow). B, With swimmer’s positioning, the arrow depicts a pretracheal lymph node just above the thyroid isthmus, and just beneath the larynx. This node has been referred to as the Delphian node and is not visible in the left image because of artifact. Notice the asymmetry of the clavicle and scapular position and musculature in the swimmer’s position (B), making normal anatomy more difficult to assess. This later point constitutes cause for reservation of the swimmer’s position until after normal anatomy has been initially assessed with conventional (symmetric) positioning.
