Fig. 12
From: FDG-PET/CT pitfalls in oncological head and neck imaging
a Axial PET/CT image reveals compensatory FDG uptake of the left sternocleidomastoid muscle (white asterisk) and of the ipsilateral trapezius muscle (black asterisk) due to right spinal accessory nerve (XI) paralysis caused by a base skull adenocarcinoma. Also note atrophy of the right sternocleidomastoid muscle (dotted arrow) and of the right trapezius muscle (arrow). b Corresponding coronal PET/CT image depicts atrophy of the right trapezius muscle (arrow) and compensatory increased uptake of the left trapezius muscle (black asterisk)