Ulceronecrotic Mucha-Habermann disease is a severe, febrile form of pityriasis lichenoides et varioliformis acuta. The condition may sometimes have a fatal outcome, especially in elderly patients. In this paper, we are reporting on a 60-year-old male patient who suffered from the eruption of erythematous, haemorrhagic, ulceronecrotic papules accompanied by high temperature. Erosions and ulceronecrotic papules covered over 80% of his body. Three weeks after his admittance to our hospital, clinical signs resembling ileus together with the leucocytosis occurred. The patient was transferred to the department of internal medicine and later to the surgery department. The fulminant course of the disease could not be stopped, and the patient died of severe intestinal and colon gangrene caused by the massive thrombosis of superior mesenteric artery. Up to date, only 23 cases of this severe form of the disease have been reported, and even with the early recognition, fulminant course may lead to death.