case_images: PMC9713027_01
case_images: Axial CT scan without contrast showing the pineal region tumor at the time of the initial diagnosis in 2014 (yellow arrowhead).
case_images: fneur-13-1019955-g0001.jpg
case_images: PMC9713027_01_fneur-13-1019955-g0001.jpg
case_images: F1
case_images: The patient had a history of pineal region tumor and hydrocephalus which were diagnosed 7 years prior from another hospital (Figure 1).
case_images: Axial (A) and coronal (B) MR scan at 7 years after the initial diagnosis show implantation metastasis under burr hole post stereotactic biopsy (gray arrowhead). Sagittal (C) MR scan shows no tumor on the pineal region (yellow arrowhead).
case_images: fneur-13-1019955-g0002.jpg
case_images: PMC9713027_01_fneur-13-1019955-g0002.jpg
case_images: F2
case_images: The lesion appeared to be causing a mass effect with the shifting of the midline (Figure 2).
case_images: Pathology from implantation metastasis shows a typical pineal parenchymal tumor of intermediate differentiation (PPTID). Microscopy examination of tumor showed round-shaped cells with vesicular hyperchromatin, scanty eosinophilic cytoplasm, and nuclear atypia (a). Immunohistochemical analyses show positive expression of synaptophysin (b) and chromogranin (c) (x100 magnification).
case_images: fneur-13-1019955-g0003.jpg
case_images: PMC9713027_01_fneur-13-1019955-g0003.jpg
case_images: F3
case_images: The resulting final pathological assessment was PPTID (Figure 3).
case_images: Axial (A), coronal (B), and sagittal (C) MR scan with contrast showing no tumor growth at the 2-year follow-up.
case_images: fneur-13-1019955-g0004.jpg
case_images: PMC9713027_01_fneur-13-1019955-g0004.jpg
case_images: F4
case_images: The patient was still disease-free at the latest follow-up at the 2-year mark (Figure 4).