Malignant Histiocytic Disease, also known as histiocytic disorders, malignant, is related to inflamed seborrheic keratosis and thymoma type b2. An important gene associated with Malignant Histiocytic Disease is TRMT61B (TRNA Methyltransferase 61B), and among its related pathways/superpathways are Innate Immune System and Class I MHC mediated antigen processing and presentation.