To evaluate the usefulness of magnetic resonance angiography (MRA) in pulmonary and mediastinal diseases, 24 cases (15 lung cancers, 2 metastatic lung tumors and 7 other diseases) were studied with the 3D FLASH (TE = 3 msec.) method. In resected cases, MRA images were compared with intraoperative findings. Twenty of 24 cases were consistent with intraoperative findings. In 4 resected cases in which the findings were inconsistent, pulmonary angiography (PAG) findings were similar to those of MRA. From these results, MRA is considered an effective and non-invasive method for evaluation of pulmonary vessels.