PET-NEGATIVE LUNG ADENOCARCINOMA ARISING WITHIN A BENIGN-APPEARING PULMONARY BULLA: A RARE CASE OF SYNCHRONOUS PRIMARY LUNG CANCERS. YHCĐ [Internet]. 2026 June 2 [cited 2026 Sept. 9];67(English Version No 1, 2026). Available from: https://tapchiyhcd.vn/index.php/yhcd/article/view/5106