Fig. 1

Radiologic characterization of endolymphatic sac tumor. a, b CT in the axial plane demonstrated an expansile lytic lesion of left mastoid process and middle ear extending posteriorly to the posterior cranial fossa (a) with apparent enhancement in contrast imaging (b). c–e MR in the axial plane showed the lesion to be uniformity hypo-signal on the T1-weighted (c) and high-low mixed signs on the T2-weighted (d), and obviously enhanced with contrast (e). f Three-dimensional computerized tomographic angiography ( 3D-CTA ) manifested main blood supply of lesion was from the external carotid artery and branches of the subclavian artery