Melanotic meningioma

Melanotic meningioma (also known as meningeal melanocytoma) is a rare histological variant of WHO grade I (benign) meningioma

As only several dozen cases have been reported in the literature, no significant prevalence difference was found between gender or age groups.

Melanotic meningiomas arise from leptomeningeal melanocytes, a small pigment cells found mostly in the meninges covering the ventrolateral surfaces of the medulla oblongata, posterior fossa or Meckel cave 1,2.

Given the small number of reported cases it is difficult to determine the most characteristic appearance.

CT

These tumours are most commonly isodense to grey matter, with variable enhancement 2.

MRI

Different signal intensities are probably correlated with the amount of melanin in the pigment cells. Possible causes of low signal intensity on T2-weighted sequences include decreased water content, paramagnetism, susceptibility effects or hemorrhage 5

  • T1: iso- or hiperintense 1,4
  • T2: hipo- or hiperintense
  • T1 C+: homogenous enhancement

Similarly to other meningiomas the treatment or melanotic meningiomas is usually surgical excision, with complete tumor removal being the best therapeutic option (in terms of disease-free survival) 3.

 

 


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Article Information

rID: 42475
Synonyms or Alternate Spellings:
  • Melanotic metaplastic meningioma
  • Melanotic metaplastic meningiomas
  • Melanotic meningiomas

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