Figure it out fridays
A 50 year old woman presented to the ED with increasing painful and enlarged mass in the anterior neck. WBC 13 and CRP 15 md/dL She had been given antibiotics for 5 days without clinical improvement. Imaging was done and results are as shown. Failure of rigid esophagoscopy prompted a thyrotomy. A fish bone which the patient swallowed a month ago had perforated the esophagus and migrated into the thyroid.
What is the best imaging modality to detect a migrated fishbone?