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Our results, in accordance with literature, clearly indicate that patients with negative FDG-PET results are unlikely to progress or relapse during a long follow-up. However, false positive uptake is a problem. We have investigated the effect of age, histological subtype, clinical stage and the type of treatment on the accuracy, but on the basis of these facts we could not find any significant difference. However, the date of the investigation influenced the results: before 2000 the number of false results was significantly higher than after that time, which shows the importance of investigators' experience.

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Repeat lymphography was done in 33 patients following radiotherapy between 8--73 months. Absorbed dose delivered by 60Co-teletherapy ranged between 30--45 Gy-s in subdiaphragmatic and 30,6--56 Gy-s in mediastinal region. The main sequel of radiation was decrease in nodal size (66,6%), lumen narrowing of lymphatic vessels (51,5%); number of lymph nodes and lymph vessels diminished rarely (6%). Blocking of lymph circulation never developed. Dilatation of thoracic duct with accelerated contrast flow rate was thought to be arteficial due to decreased pooling capacity of decreased nodal size. Radiation induced changes develop within 12 months and do not progress further on. It is concluded that changes are mainly affected by the level of absorbed dose.

Using the London criteria with liver activity as the threshold seems to be a good approach for the interpretation of post-treatment F-FDG PET/CT studies because of its high accuracy and simplicity.