In my article on the relation between parapsoriasis en plaques disséminées and incipient mycosis fungoides1 it was suggested that the former dermatosis probably is the precursor of the latter disease in most if not all cases. It was further implied that parapsoriasis en plaques disséminées, parapsoriasis "lichenoides" of French authors, parakeratosis variegata (Unna, Santi and Pollitzer) and the retiform type of parapsoriasis with its transitions to "poikiloderma" are, in all likelihood, phases of a single condition terminating in mycosis fungoides in the vast majority of instances; that these dermatoses are distinct from parapsoriasis guttata (pityriasis lichenoides chronica of Juliusberg) and the group of parapsoriasis varioliformis, the latter two diseases showing no tendency to evolve into mycosis fungoides; and that a defective nomenclature has been responsible, in part at least, for the inclusion of unrelated conditions in one category. These statements find direct confirmation in the prophetic opinions voiced by
KEIL H. PARAPSORIASIS EN PLAQUES DISSÉMINÉES AND INCIPIENT MYCOSIS FUNGOIDES: SUPPLEMENTARY DATA ON THEIR RELATIONSHIP. Arch Derm Syphilol. 1938;38(4):545–554. doi:10.1001/archderm.1938.01480160037004
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