Reference for Chullin 95:16

רב נחמיה בריה דרב יוסף בדיק לה בפשורי

R'Joseph B'Manyomi surely said in the name of R'Nahman, If the lung was pierced but the perforation was covered up by the [chest] wall, it is permitted! - There is no contradiction: in the latter case the adhesion was formed in that part where by natural development they [sc. the lung and the chest wall] are in contact with each other, whereas in the former case the adhesion was not formed in that part where they are in contact by nature.

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