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Insights into Imaging
Fig. 6 | Insights into Imaging

Fig. 6

From: Detection of distant metastases and distant second primary cancers in head and neck squamous cell carcinoma: comparison of [18F]FDG PET/MRI and [18F]FDG PET/CT

Fig. 6

False positive PET/MRI (A, B) and PET/CT (C, D) in a 63-year-old female imaged for follow-up of a SCC of the larynx (T3N1) treated with radiochemotherapy. Both PET/MRI and PET/CT were rated as positive for distant mediastinal lymph node metastases. An enlarged mediastinal lymph node (arrows) shows a combination of high focal [18F]FDG uptake (SUVmax on PET/MRI = 7.5 and SUVmax on PET/CT = 6.7) and slightly heterogeneous contrast enhancement on the contrast-enhanced fat-saturated MR image. On the corresponding CT image, due to the absence of contrast enhancement, only lymph node enlargement was present (13 × 15 × 17 mm). The lymph node was rated with a score of 5 on PET/MRI and a score of 4 on PET/CT. However, mediastinoscopy with biopsy revealed sarcoidosis

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