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Triangle of safety as outlined by the superior aspect of the fifth rib inferiorly, lateral edge of latissimus dorsi posteriorly, and lateral edge of pectoralis major anteriorly. Notably, the left oblique fissure (small dashed line) passes through the triangle of safety, which leads to the risk of chest tube placement within the fissure. Original image by Henry Vandyke Carter/Public Domain and modified by the authors.
