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Horner's syndrome and Harlequin syndrome are both caused by disruptions to the sympathetic supply to the face. They have a varied aetiology, including intraneural dysfunction, extra- or intraneural compression, and idiopathic as well as iatrogenic causes. Horner's syndrome can occur as a rare complication of thyroid surgery and the Harlequin sign has only… (More)
Learning objectives This pictorial series illustrates four cases with interesting imaging presentations of some unusual primary and secondary breast malignancies and aims to exemplify the range of appearances of malignancy and stimulate discussion of atypical differential diagnoses in appropriate cases.