en Radiation Biology Radiation Biology گزارش کوتاه Short Report <b>Background: </b>Despite the relative success of surgical resection followed by proton, proton/photon, or conventional radiotherapy in terms of recurrence-free survival, chordomas are still associated with a high rate of recurrence. To our knowledge there are only very few reported cases of this rare tumor detected by F-18 FDG-PET. <b>Materials and Methods:</b> In this case we show the significance of F-18 FDG-PET/CT in detection of recurrent Chordoma in a 38 year old man with a history of the disease and a newly detected cervical lymphatic mass. <b>Results:</b> The fused PET/CT images manifested the presence of two abnormal foci of tracer uptake corresponding to a retroclavicular and an infrajugular Lymph node proved to be metastases of the previous chordoma in histopathology. <b>Conclusion:</b> Further employment of F-18 FDG-PET/CT in this rare tumour type might eventually define and establish its value in staging of chordoma. <b>Iran. J. Radiat. Res., 2012 10(2): 109‐110 </b> Chordoma, FDG-PET/CT, 18F-FDG, bone tumors 109 110 http://ijrr.com/browse.php?a_code=A-10-1-430&slc_lang=en&sid=1 A. Sabet amir.sabet@ukb.uni-bonn.de 790031947532846002915 790031947532846002915 Yes H. Ahmadzadehfar 790031947532846002916 790031947532846002916 No F.J. Huertos Lopez 790031947532846002917 790031947532846002917 No M. Muckle 790031947532846002918 790031947532846002918 No A. Schmiedel 790031947532846002919 790031947532846002919 No H.J. Biersack 790031947532846002920 790031947532846002920 No S. Ezziddin 790031947532846002921 790031947532846002921 No