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DICOM HelpSource: Local (us-east1-c)
Findings
- Well-marginated lucent lesion involving the right eccentric and dorsal clivus with an osseous excrescence/stalk projecting posteriorly from the left eccentric clivus.
Diagnosis
Ecchordosis Physaliphora
Discussion
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Indolent congenital benign mass which comes from notochord remnants. Oftentimes found incidentally.
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Cystic mass, most commonly located along the dorsal aspect of the clivus. Typically well-marginated without aggressive features. Oftentimes has an intradural component within the adjacent pre-pontine cistern that may not be apparent on CT and better characterized by MRI. May have an osseous stalk connecting the clival and intradural components (as in this case).
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Can be difficult to differentiate from a Chordoma. If the patient has a primary malignancy, consider metastasis.
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Annotated Images & Illustrations
Ecchordosis Physaliphora
Ecchordosis Physaliphora
mri