Fig 1.
Representative fusion PET/CT (A) and CT (B) images used to measure the paravertebral muscle area at C3. A 57-year-old male patient with right tonsillar cancer. Metastatic lymphadenopathy is detected at right cervical levels II–III with invasion of the right sternocleidomastoid muscle.
Table 1.
Clinical characteristics of study subjects.
Table 2.
Comparison of clinical characteristics between patients with or without sarcopenia.
Fig 2.
Comparison of skeletal muscle mass among the three groups.
SMM, skeletal muscle mass.
Fig 3.
Association between the skeletal muscle mass at L3 and that at C3 in each group.
SMM, skeletal muscle mass; HNC, head and neck cancer.
Fig 4.
Association between the skeletal muscle index at L3 and that at C3 in each group.
SMI, skeletal muscle index; HNC, head and neck cancer.
Table 3.
Summary of regression analysis.
Table 4.
Correlation between actual SMM and predicted SMM at L3 in each group.
Fig 5.
Bland-Altman plot showing the difference against the mean of actual and predicted L3 skeletal muscle masses in each group.
Lines indicate the mean and the limits of agreement. HNC, head and neck cancer.
Fig 6.
Bland-Altman plot showing the difference against the mean of actual and predicted L3 skeletal muscle indices in each group.
Lines indicate the mean and the limits of agreement. HNC, head and neck cancer.
Fig 7.
Receiver operating characteristics curve for prediction of skeletal muscle mass at L3 (A) and skeletal muscle index at L3 (B) using paravertebral muscle area at C3 in head and neck cancer patients.