Our group has shown that the omission of elective nodal irradiation on the basis of CT scans in patients with LD-SCLC lead to a higher than expected isolated nodal recurrence in the ipsilateral supraclavicular area. We have previously also shown that selective mediastinal nodal radiation on basis of FDG-PET scans in NSCLC is safe and reduces the radiation fields and hence toxicity. As the accuracy of FDG-PET scans is also in SCLC higher than CT, we will investigate the safety of selective nodal irradiation in LD-SCLC patients treated with concurrent chemo-radiation.