Monday, June 22, 2009
An extramedullary, parasagittal tumor in a 55-year-old male
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Shannon Curran, MS with her dissection Shannon Curran, a graduate student in the Modern Human Anatomy Program at the University of Co... -
Last summer I put up a post about a remarkable whole nervous system dissection that was carried out at the University of Colorado School of ...
6 comments:
Could you post the relevant MRI images Brian? Melanocytomas I have seen, and most descriptions of these, have them as intra-axial lesions, mostly in the cortex, and not extra-axial meningioma-like masses. So I'd be interested in seeing the MRI scans before making a final judgment on the real nature of this tumor. Thanks--Douglas C Miller MD,PhD
I wish I could provide the MRI, Doug. But this is actually a case I looked at with Dr. Peter Burger at Hopkins when I did a short rotation with him during my fellowship a few years back. (I am posting it now because I was going over a case with a resident recently and the issue of melanocytoma came up.) This case was sent to Dr. Burger from a pathologist in Dusseldorf, Germany with an accompanying cover letter saying that the radiological impression was that of extra-axial meningioma. But there were no MRI images sent with the slides. The pathologic diagnosis of melanocytoma was made by Burger.
The second picture is that hmb45 or mela or something else like s100.
The second picture is simply that of an H&E stained slide. The pigment is endogenous melanin.
My impression is that primary intra-axial melanocytic tumors are the exception:
Brat DJ, Giannini C, Scheithauer BW, Burger PC. Primary melanocytic neoplasms of the central nervous systems. Am J Surg Pathol. 1999 Jul;23(7):745-54.
Interesting thing is that the behavior of these tumorous primary melanocytic lesions is only loosely linked to histology. Long-term recurrence free survival is not uncommon with primary meningeal melanomas.
The dark side of the coin is that for those unfortunate patients who present with a melanocytosis pattern of growth, benign cytology is no consolation, as inexorable spread and poor response to therapy is virtually universal.
It seems that with melanocytic CNS tumors, we're further away than an MRI from knowing their real nature.
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