A 75-yr-old male hospitalized for vascular purpura with joint pain had a medical history of polymyalgia rheumatica. A generalized oedematous syndrome occurred and the patient also presented with haemoptysis and complained of transient paraesthesia of the hands and feet. Renal biopsy showed lesions of focal segmental proliferative glomerulonephritis associated with a few cellular crescents. Lung biopsy showed small-cell neuroendocrine carcinoma. After the first course of chemotherapy signs of vasculitis disappeared. Small-cell neuroendocrine carcinomas, which represent 25% of all lung cancers, have numerous paraneoplastic (especially neurological) extrapulmonary manifestations. Disseminated vasculitis has never been described with this type of cancer, whereas nonsmall-cell carcinomas are associated essentially with cutaneous vasculitis or purpura rheumatica. In the case reported here, anticancer chemotherapy allowed vasculitic manifestations to be treated.
