Definition of "histiocytosis" []

• Any of several abnormal conditions characterized by the appearance of histiocytes in the blood or tissues. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "Of note, according Kallen and colleagues, there were 6 cases of a rare white blood cell disorder called histiocytosis (against 1 expected)."
• "And in doing so they have also told the rare disease community with truly rare diseases such as histiocytosis which affects 1 in 200,000 or apx 1600 americans that we have no hope to find cures for our children because it is too rare to matter."
• "Langerhans cell histiocytosis (LCH) Histiocytosis is a rare blood disease that is caused by an excess of white blood cells called histiocytes."