They removed a lobe.
Besides the cancer medical procedures at 85 often result in death from complications such as pneumonia.
Pneumonia a real issue— correct. Even with strenuous hands on rehab people/ respiratory therapy people to push the patient to frequently use a incentive spirometer to keep the lung inflated and prevent what is called atalectasis (the alveoli accumulating mucus, and getting infected from airborne bacteria— hence... pneumonia). She’s missing a lobe— at her age.. yep, distinct possibility.