OBJECTIVE: TO describe a patient with invasive pulmonary aspergillosis related to short-term steroid treatment. CASE SUMMARY: A 78-year-old man with chronic obstructive pulmonary disease (COPD) developed an invasive pulmonary aspergillosis after short-term (less than 1 week) intravenous steroid therapy, The diagnosis was established by recovering Aspergillus fumigatus from a bronchoalveolar lavage and was confirmed by autopsy, with the additional finding of an aspergilloma, DISCUSSION: This case is of interest for 3 reasons: (1) it illustrates that invasive aspergillosis may be followed by a rapidly progressive respiratory failure, even in the absence of a fever; (2) this patient had simultaneously an aspergilloma and an invasive aspergillosis; and (3) it confirms reports indicating that short-term steroid therapy for COPD represents a significant risk factor for opportunistic lung infections, CONCLUSIONS: In patients with COPD who receive even short-term steroid therapy and who have progressive respiratory failure caused by pneumonia, invasive aspergillosis should be suspected early and acted upon accordingly.