Sudden aggravated CD8 + mycosis fungoides accompanied by hidden adenocarcinoma of the colon.

Mycosis fungoides (MF) is the most common type of cutaneous T-cell lymphoma (CTCL). The neoplastic T cells in MF are usually mature CD4+ T cells, and CD8+ phenotype expression is rarely observed.1 There are 2 categories of CD8+ CTCL, one with aggressive behavior and one with indolent behavior.2 We report a rare case of suddenly aggravated CD8+ MF that was found to be associated with a hidden adenocarcinoma in the colon.