Cerebral metastasis - melanoma

Case contributed by A.Prof Frank Gaillard

Presentation

Seizure.

Patient Data

Age: 55 years
Gender: Female
MRI

A peripherally enhancing mass at the grey-white matter junction of the supramarginal gyrus with significant surrounding edema. Central diffusion restriction is likely secondary to blood products admixed with proteinacous necrotic material. 

Conclusion: The differential is primarily that of a hemorrhagic metastasis (e.g. melanoma). A cavernoma would not be expected to have this degree of enhancement or diffusion restriction. An abscess is possible but the degree of signal loss is more consistent with blood than the thin low T2 rim seen in abscesses. 

Case Discussion

The patient went on to have a resection.

Histology

Sections show brain parenchyma with extensive degenerative changes, microglial activation and foamy macrophages. There are separate fragments of necrotic tissue present. A single 2mm fragment of viable tumor composed of epithelioid to spindled cells with abundant pale eosinophilic cytoplasm, oval hyperchromatic nuclei and small nucleoli are present.

Immunohistochemistry shows strong nuclear staining for SOX-10 in the atypical cells seen in the very small tissue fragment. There is also strong cytoplasmic staining for tyrosinase and melan A.

FINAL DIAGNOSIS: extensively necrotic metastatic malignant melanoma.

PlayAdd to Share

Case information

rID: 54718
Published: 5th Jun 2018
Last edited: 14th Aug 2019
Inclusion in quiz mode: Included

Updating… Please wait.

 Unable to process the form. Check for errors and try again.

 Thank you for updating your details.