PMC3115159_01
MRI of the intracranial torcular metastatic paraganglioma showing contrast enhancement on T1, hyperintensity on T2, and bony erosion without hyperostosis on CT images
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F1
During his oncologic workup, CT and MRI of the brain were performed, which demonstrated a large left extra-axial occipital lesion measuring 2.9 x 4.5 cm compressing the torcula, left transverse sinus, and posterior sagittal sinus with the invasion of and through the occipital calvarium into the soft tissues of the scalp [Figure 1].
Representative area of the tumor stained with (H and E, x10 and x20), illustrating nests of round blue cells with round-to-ovoid nuclei and distinct cytoplasmic borders
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F2
Microscopic examination revealed an infiltrating neoplasm composed of nests of round blue cells with round-to-ovoid nuclei, smudgy chromatin, moderate amount of eosinophilic cytoplasm, and distinct cytoplasmic border with no necrosis appreciated, and rare mitotic figures which were determined to be consistent with metastatic paraganglioma [Figure 2].