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WHO Classification of Tumours
Malignant histiocytosis
Thymus


Definition

Malignat histiocytosisis is no longer considered a valid diagnostic term. In the past, cases of anaplastic large cell lymphoma were called malignant histiocytosis or reticulum cell sarcoma on purely morphological grounds, but only a small number proved to be of true macrophage or dendritic cell origin
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Swerdlow SH, Campo E, Harris NL, Jaffe ES, Pileri SA, Stein H, Thiele J, Vardiman JW (Eds.)
WHO Classification of Tumours of Haematopoietic and Lymphoid Tissues
4th Edition
International Agency for Research on Cancer: Lyon 2008



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In retrospect, most cases are now considered anaplastic large cell lymphoma while others may habe been misclassified haemophagocytic syndromes.