A patient sustains a knife wound through the right fouh intercostals space, 2 cm to the right of the sternum. The area most likely penetrated by the knife is the

The right border of the hea is approximately 1 to 2 cm to the right of the right border of the sternum; therefore, the knife probably did not hit the hea. The middle lobe of the right lung extends from the level of the fouh costochondral junction to the level of the fifth intercostal space. The middle lobe is most likely at the level of the fouh intercostal space.