PMC6689955_01
Pre-operative magnetic resonance images revealed a cystic lesion that was T1 hypointense, T2 hyperintense, and peripherally enhancing within the left cerebellopontine angle wrapping around the lateral brainstem. Adjacent to the cystic lesion was a T1 isointense, T2 hyperintense, avidly enhancing infiltrative component involving the brainstem, cerebellar peduncle, and cerebellum. (A) Coronal T1-weighted contrast enhanced. (B) Axial T1-weighted contrast enhanced. (C) Sagittal T1-weighted contrast enhanced. (D) Diffusion weighted-imaging. (E) Apparent diffusion coefficient. (F) Fluid-level attenuated inversion recovery.
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F1
Adjacent to the cystic lesion was a T1 isointense, T2 hyperintense, avidly enhancing infiltrative component involving the brainstem, cerebellar peduncle, and cerebellum (Figure 1).
Hemotoxylin and eosin stain demonstrating keratin material with small clusters of atypical squamoid cells and keratin pearls consistent with squamous cell carcinoma. (A) 10x magnification. (B) 20x magnification.
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F2
Pathology demonstrated keratinizing SCC with some sections consisting of almost entirely anucleated keratin material (Figure 2).