Progressive nodular histiocytosis is a proliferative process of histiocytes, the main element of which is the dermal dendrocyte. It is considered to form part of a group of histiocytic disorders related to juvenile xanthogranuloma, which also includes xanthoma disseminatum, benign cephalic histiocytosis, spindle cell xanthogranuloma and generalized eruptive histiocytosis; disorders which perhaps represent the spectrum of one single entity. We present the case of a 57-year-old man who, for 26 years, had had a progressively deforming process of cutaneous lesions, with systemic involvement, including chronic myeloid leukaemia, hepatosplenomegaly, hypothyroidism, hyperuricaemia and hypocholesterolaemia. We have not been able to establish precisely the relationship between these features.

Progressive nodular histiocytosis is a proliferative process of histiocytes, the main element of which is the dermal dendrocyte. It is considered to form part of a group of histiocytic disorders related to juvenile xanthogranuloma, which also includes xanthoma disseminatum, benign cephalic histiocytosis, spindle cell xanthogranuloma and generalized eruptive histiocytosis; disorders which perhaps represent the spectrum of one single entity. We present the case of a 57-year-old man who, for 26 years, had had a progressively deforming process of cutaneous lesions, with systemic involvement, including chronic myeloid leukaemia, hepatosplenomegaly, hypothyroidism, hyperuricaemia and hypocholesterolaemia. We have not been able to establish precisely the relationship between these features.

A 65-year-old woman on whom a cardiac catherization using iodine contrast had been performed developed 5 days later acute renal failure, respiratory insufficiency and cutaneous lesions consisting of two great vegetating masses located on both cheeks and pustular vesicular lesions on the extremities. A fortnight later, the patient died. We would like to stress this case because of the exceptional nature of vegetating iododerma at present, and the importance of recognizing a possibly fatal disease.

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