Inclusion Criteria:  18 years or older Having cranial CTA withdrawn Having blood lipids, HbA1c, blood glucose, AST, ALT measured in 3 months before and 3 months after cranial CTA  Exclusion Criteria:  Thyroid disease Having had neck surgery Use of corticosteroids for more than 6 months Presence of lymph nodes in the anterior neck Hypertrophy of neck muscles