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Figure 1: (a and b) Axial sections of the computed tomography of the brain bone window shows permeative type of destruction (red arrow) of the posterior aspect of the left petrous temporal bone extending to the mastoid. Erosions of the ossicles and inner ear structures are seen with soft tissue in the middle ear. (c) Magnetic resonance imaging sagittal T1 sequence shows mixed intense lesion (arrow) in the cerebellopontine angle region with areas of hyperintensity suggestive of haemorrhage/proteinaceous material. (d) Magnetic resonance imaging T2 FLAIR sequence shows an extra-axial, well-defined lesion (arrow) with multi-cystic appearance and mixed intensity in the left cerebellopontine angle region. (e) Axial T2 sequence. (f) Axial FIESTA sequence confirms the extra-axial location of the multi-cystic lesion causing displacement and compression of the left middle cerebellar peduncle (arrow). (g) Magnetic resonance imaging axial diffusion sequence shows no areas of diffusion restriction. (h) Histopathology slide shows the papillary cystic structures lined with simple cuboidal and columnar epithelium. Siderophages, cholesterol clefts, and clear cells (vacuolated cells) are seen, which are indicative of papillary adenomatous tumor

Figure 1: (a and b) Axial sections of the computed tomography of the brain bone window shows permeative type of destruction (red arrow) of the posterior aspect of the left petrous temporal bone extending to the mastoid. Erosions of the ossicles and inner ear structures are seen with soft tissue in the middle ear. (c) Magnetic resonance imaging sagittal T1 sequence shows mixed intense lesion (arrow) in the cerebellopontine angle region with areas of hyperintensity suggestive of haemorrhage/proteinaceous material. (d) Magnetic resonance imaging T2 FLAIR sequence shows an extra-axial, well-defined lesion (arrow) with multi-cystic appearance and mixed intensity in the left cerebellopontine angle region. (e) Axial T2 sequence. (f) Axial FIESTA sequence confirms the extra-axial location of the multi-cystic lesion causing displacement and compression of the left middle cerebellar peduncle (arrow). (g) Magnetic resonance imaging axial diffusion sequence shows no areas of diffusion restriction. (h) Histopathology slide shows the papillary cystic structures lined with simple cuboidal and columnar epithelium. Siderophages, cholesterol clefts, and clear cells (vacuolated cells) are seen, which are indicative of papillary adenomatous tumor