Author: Lauren N. Stuart, M.D., M.B.A. (see Authors page)

Revised: 17 December 2015, last major update June 2013

Copyright: (c) 2003-2015,, Inc.

PubMed Search: Fontana-Masson
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Cite this page: Fontana-Masson. website. Accessed January 22nd, 2019.
Definition / general
  • Melanin stain
  • Interpretation: melanin granules reduce ammonia-silver nitrate and turn black, but difficult to interpret faint staining in sparsely positive cells
Microscopic (histologic) images

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Melanotic neuroectodermal tumor of infancy

Positive staining - normal
Positive staining - disease