Fig. 1

Example of pseudoprogression in a patient with metastatic lung cancer. Target lesion: after initial increase of the lung cancer the lesion showed a subsequent shrinkage. Non-target lesion: initial increase of a paracardial lymph node. New measureable lesion: at the first follow-up new perirectal soft tissue lesion (17 mm) which decreased at the following examinations. New non measureable lesion: further small new perisplenic lesion (9 mm) which disappeared completely after 4 month