PMC8794440_01
Thoracic FDG-PET/CT: anterior mediastinal mass (arrow) with mild uptake. FDG-PET, fluorodeoxyglucose-positron emission tomography; CT, computed tomography.
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In the anterior mediastinum there was a solid 25 mm nodule with an SUV of 2.4, interpreted in the CT as well as in the PET scan, as a pre-vascular lymph node enlargement (Figures 1,2).
Cross-section of the papillae surrounded by a mucin pool. One papilla shows mucin-producing cells and ciliated cells and the other basal and ciliated cells (HE, 40x).
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Microscopy showed a focal area of irregular fibrosis and a papillary neoplasm with ciliated columnar epithelial cells, mucin-producing cells, basal cells, mucus lakes within the alveoli and absence of necrosis and nuclear atypia (Figure 3).