case_images: PMC9082194_01
case_images: T1-weighed MRI demonstrates a 26-millimeter peripherally enhancing extra-axial lesion (arrow) in the left cerebellopontine angle with adjacent edema and mild mass effect in the left cerebellum. MRI, magnetic resonance imaging.
case_images: crn-0014-0191-g01.jpg
case_images: PMC9082194_01_crn-0014-0191-g01.jpg
case_images: F1
case_images: There was adjacent edema and mild mass effect in the left cerebellum, with no evidence of hydrocephalus or midline shift (Fig. 1).
case_images: Microscopic images of the patient's tumor show focal perivascular sheets of spindle cells and areas of geographic necrosis (a; hematoxylin and eosin staining; x100). At higher magnification, a psammoma body and conspicuous nucleoli are appreciated, along with an occasional mitotic figure (b; hematoxylin and eosin staining; x400). Immunohistochemistry demonstrates focal positivity for PR (c; x400) and a Ki-67 proliferation index of 8-10% (d; x400).PR, progesterone receptor.
case_images: crn-0014-0191-g02.jpg
case_images: PMC9082194_01_crn-0014-0191-g02.jpg
case_images: F2
case_images: Immunohistochemistry demonstrated negativity for estrogen receptor, focal positivity for progesterone receptor, weak positivity for somatostatin receptor 2, and a Ki-67 proliferation index of 8-10% (Fig. 2).
case_images: T1-weighed MRI at three and a half years of follow-up demonstrates the absence of edema and no evidence of tumor recurrence. MRI, magnetic resonance imaging.
case_images: crn-0014-0191-g03.jpg
case_images: PMC9082194_01_crn-0014-0191-g03.jpg
case_images: F3
case_images: At three and a half years of follow-up, the patient is stable with no symptoms of neurologic decline and with no radiographic evidence of tumor recurrence (Fig. 3).