A chest tube is being placed for a pleural effusion using the triangle of safety. Which set of boundaries correctly defines this triangle?
- A Latissimus dorsi anteriorly, trapezius medially, twelfth rib inferiorly
- B Pectoralis major anteriorly, latissimus dorsi laterally, fifth intercostal space or horizontal nipple line inferiorly ✓
- C Sternocleidomastoid anteriorly, trapezius posteriorly, clavicle superiorly
- D Rectus abdominis medially, external oblique laterally, inguinal ligament inferiorly
Correct answer: B. Pectoralis major anteriorly, latissimus dorsi laterally, fifth intercostal space or horizontal nipple line inferiorly
Explanation
The triangle of safety is bounded by the lateral edge of pectoralis major in front, the anterior border of latissimus dorsi behind, and a line at the level of the fourth or fifth intercostal space (horizontal nipple line) below, with the axillary apex above. Within it the musculature is thin and the risk of injury to the long thoracic nerve and lung is minimised.
Reference: Bailey and Love's Short Practice of Surgery, 28th ed.
High-yield for: NEET PGINI-CETNExTFMGEUSMLEPLABMRCP
Written and medically reviewed by the StethoPrep medical team.