FIGURE 4.

Focal ¹⁸F-SKI uptake in right psoas muscle is consistent with metastasis (patient 3). (A) Axial PET images at 10 and 20 min demonstrate small focus of uptake in musculature (white arrow). (B) Maximum-intensity-projection image at 20 min shows prominent liver uptake; no definite lesion is seen. Dotted line indicates location of lesion. Of note, this was the only metastasis in this patient (status: after right nephrectomy). (C) Noncontrast companion CT image shows subtle low-attenuation area in right psoas muscle (white arrow). (D) This area shows contrast enhancement as seen on axial T1-weighted postcontrast MR image.