Brain abscess following marrow transplantation: experience at the Fred Hutchinson Cancer Research Center, 1984-1992.

The etiology of brain abscess in patients undergoing marrow transplantation at the Fred Hutchinson Cancer Research Center in Seattle was assessed in a retrospective review. Fifty-eight patients with histology- or culture-proven brain abscess diagnosed between January 1984 and March 1992 were identified. A fungus was isolated in 92% of cases. Aspergillus species were the most prevalent fungi (58% of cases), and Candida species were second in frequency (33%); sporadic cases were caused by Rhizopus, Absidia, Scopulariopsis, and Pseudallescheria species. Bacteria were involved in fewer than 10% of cases. There was no appreciable variation from year to year in the incidence of brain abscess over this period. Aspergillus brain abscess was associated with concomitant pulmonary disease (87% of cases), whereas candida brain abscess often occurred in association with fungemia (63% of cases) or neutropenia (63%). Mortality was high (97%); the risk of death was unrelated to etiology or therapeutic regimen. Since the etiology of brain abscess in patients undergoing marrow transplantation is primarily fungal, the development of better antifungal therapeutic and/or prophylactic modalities is warranted.