PMC5569395_01
(a) MRI T2 CIS axial demonstrating pre-pontine and ambient cistern lesion in 2010. (b) MRI T1 post gadolinium in 2010 demonstrating no significant enhancement. (c) MRI T1 post gadolinium in 2015 demonstrating no significant enhancement. (d) MRI T1 post gadolinium in 2016 demonstrating lobulated, enhancing mixed cystic/solid lesion
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F1
The patient awoke well initially, however, subsequently developed a House-Brackmann grade 5 facial palsy on day 2 [Figure 1].
(a) first histology H and E staining demonstrating benign squamous cyst wall and keratin with no malignant features. (b) Second resection histology H and E staining showing metastatic squamous cell carcinoma features. (c) and (d) immunohistochemistry staining demonstrating malignant squamous cell markers of CK 5/6 and positive nuclear staining for P63
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F2
There were no malignant features [Figure 2].