Fig. 6.
A 68-year-old woman with untreated squamous cell carcinoma. Multiple intensity projection (MIP) images showing 18F-FDG uptake in two groin LNs (thin arrows) and one pelvic LN (thick arrow) (a). 18F-FDG-PET showing focal uptake both in the right (score 2 at visual assessment, SUVmax 2.5) and in the left (score 2 at visual assessment, SUVmax 6.0) groin LN (thin arrows) (b). At low-dose CT, the right LN shows short axis diameter of 11 mm and round shape, the left LN short axis of 16 mm, round shape and possible necrosis (thin arrows) (c). At overall assessment, both LNs are judged as clearly abnormal. Pathologic examination showed reactive features in all the right groin LNs removed (d) and metastasis in the largest LN among those removed in the left groin (e). The pelvic LN, which was located in the obturator region (PET and CT images not shown), was metastatic at histopathology