Fig. 1

Serial chest radiographs and computed tomography scans of a 74-year-old woman with spontaneous remission of non-small cell lung cancer. a: Radiograph in January 2015 showed a left lung mass (white arrow). b: A 5.1 × 2.9 cm lung mass in the left upper lobe (black arrow) was observed on computed tomography (CT) images at the time of initial chest radiograph (a). c and d: After fifth-line chemotherapy, follow-up radiograph (c) and CT scans (d) in April 2014 showed an increase in size of the left lung mass. e and f: One year after the discontinuation of chemotherapy, significant reduction in size of the lung mass was demonstrated on follow-up radiograph (e) and CT scans (f) in July 2018