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Invasive pulmonary aspergillosis is increasingly described in non-neutropenic patients, such as patients with COPD receiving corticosteroids and the critically ill. Here, we present a case of a lethal pulmonary Aspergillus niger infection in a COPD patient. Immunological tests showed an impaired innate and adaptive immune response to Aspergillus. A history of COPD, unresponsiveness to antibiotics and especially a suggestive CT-scan should trigger the clinician to consider diseases caused by Aspergillus. Keywords: Invasive pulmonary aspergillosis, Aspergillus niger, Immune system, Intensive care unit, Oxalate crystal