Figure 3.

A 49-year-old female presenting with an ulcerating mass on the inner margin of the right arm just above the elbow. (a) Coronal T1W TSE, (b) axial PD-SPAIR MR images and (c) longitudinal US show a lobular hypoechoic mass (arrows), isointense on T1 and heterogeneously hyperintense on SPAIR images, which is forming a sinus to the skin (arrowheads-a,b), the features being consistent with a “collar stud” abscess. Biopsy revealed chronic necrotising granulomatous infection consistent with tuberculosis.