Chordoma of petrosal mastoid region: A case report

Figure 1 Brain magnetic resonance imaging before surgery. A, B: T2-weighted axial images (A) and T1-weighted images (B) showed a lobulated mass (white thick arrow) in the petrous part and mastoid area of the left temporal bone, swelling to the brain, with isointense and hypointensity signal on T1-weighted images, hyperintensity and slightly hyperintensity signal on T2-weighted images , and there was a small cystic degeneration area inside (white fine arrow), the surrounding bone was damaged, and the left cerebellar hemisphere was compressed to deformation; C: Fluid-attenuated inversion recovery coronal magnetic resonance imaging (MRI) showed a mass with hyperintensity signal (white thick arrow), and the boundary was clear; D: T1-enhanced axial sequence showed uneven obvious contrast enhancement. There was no enhancement in the cystic degeneration area (white small arrow). Brain MRI at 5 years after surgery; E, F: T2-weighted axial images (E) and T1-weighted images enhanced (F) sequence showed postoperative changes in the left mastoid area, but no definite abnormal signs were found.

Figure 2 Histological examination of chordoma. A: Epithelioid polygonal cells with clear or palely eosinophilic cytoplasm arranged in clusters and cords (hematoxylin and eosin, 100×). B: Immunohistochemical examination showed positive expression of epithelial membrane antigen (magnification 100×).