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Figure 2: (a and b) Axial sections of the computed tomography of the brain, bone window shows the permeative type of destruction (arrow) of the posterior petrous ridge in the region of the endolymphatic sac. The lateral semicircular canal and middle ear ossicles are normal. (c) Magnetic resonance imaging axial T2 sequence shows a heterogenous lesion entering into the fovea of endolymphatic sac (arrow). (d) Magnetic resonance imaging post-contrast T1 sequence shows a heterogenous significant enhancement of the lesion (arrow). Internal auditory canal is well seen and is not involved. (e) Histologic section shows a papillary architecture. The stroma of the papillary fronds are richly vascularized. The papillary structures are lined by a single layer of cuboidal cells

Figure 2: (a and b) Axial sections of the computed tomography of the brain, bone window shows the permeative type of destruction (arrow) of the posterior petrous ridge in the region of the endolymphatic sac. The lateral semicircular canal and middle ear ossicles are normal. (c) Magnetic resonance imaging axial T2 sequence shows a heterogenous lesion entering into the fovea of endolymphatic sac (arrow). (d) Magnetic resonance imaging post-contrast T1 sequence shows a heterogenous significant enhancement of the lesion (arrow). Internal auditory canal is well seen and is not involved. (e) Histologic section shows a papillary architecture. The stroma of the papillary fronds are richly vascularized. The papillary structures are lined by a single layer of cuboidal cells