Table 2.

Findings of FDG-PET imaging in patients with polymyositis and dermatomyositis.

Case	Increased FDG Uptake in Muscles		Abnormal Uptake	Increased FDG Uptake in Extramuscular Lesions
Case	Uptake	Site of Increased FDG Uptake	Abnormal Uptake	Increased FDG Uptake in Extramuscular Lesions
1	–		+	Lung
2	–		–	–
3	+	Bil. shoulders, upper arms, back	–	Parotid gland and cervical LN^*
4	+	Bil. shoulders, forearms, bil. hip, lower legs	–	Mediastinal LN^*
5	+	Neck, bil. upper arms, forearms, hip	–	–
6	+	Bil. upper arms, bil. thigh	+	Lung, mediastinal LN^*
7	–		–	–
8	–		–	Hilar LN
9	+	Bil. upper arms, back	+	Lung
10	–		–	Cervical and mediastinal LN^*
11	–		–	Hilar LN^*
12	–		–	Ascending and sigmoid colon^*
13	+	Bil. shoulders, upper arms	–	–
14	–		–	Thyroid gland^*
15	–		–	Palatine tonsil^*
16	–		+	Lung
17	+	Bil. shoulders, upper arms, back	–	Hilar and mediastinal LN^*
18	–		–	Cervical LN^*
19	–		+	Lung
20	–		+	Lung
21	–		–	Mediastinal LN^*
22	–		–	Rectum^*
23	–		+	Lung
24	+	Bil. shoulders, upper arms, bil. hip, thigh, back	+	Lung and lung cancer

↵* Physiological FDG uptake. FDG-PET: F-18 fluorodeoxyglucose positron emission tomography; Bil. bilateral; LN: lymph nodes.