After primary treatment with curative intent for soft tissue sarcoma, patients fulfilling the inclusion criteria and giving informed consent are enrolled. In study protocol patients have their regular chest x-ray once in two months plus ultra-low-dose computed tomography imaging is repeated seven times during the first two years of follow-up. After two years patients without detectable metastases continue in regular follow-up program. The aims of this prospective comparative study are to investigate whether ultra-low-dose computed tomography is more accurate than chest x-ray in soft tissue sarcoma and especially whether the most fast-growing pulmonary metastases could be detected earlier.
The goal of this interventional study is to compare sensitivity of regular chest x-ray to ultra-low-dose computed tomography to find pulmonary relapse in follow-up of soft tissue sarcoma. The main question[s] it aims to answer are:~Is ultra-low-dose computed tomography more sensitive than regular chest x-ray to find pulmonary relapse?~Does ultra-low-dose computed tomography detect the most fast-growing pulmonary metastases earlier than regular chest x-ray?~Participants will have seven ultra-low-dose computed tomography imagings in addition to simultaneous routine protocol of chest x-rays. Participants therefore work as their own controls.