Factitious fungus in two children with cancer receiving liposomal amphotericin.

Amphotericin B deoxycholate and liposomal formulations of amphotericin are often started and continued empirically, in immunocompromised hosts, based on the computed tomography findings and the patient's clinical picture. The authors describe two patients with presumed fungal pulmonary nodules, which were progressive despite prolonged treatment with liposomal amphotericin B. At subsequent biopsy, neither had evidence of active fungal disease; rather, the nodules revealed reactive changes and lipid-laden macrophages. These cases underscore the importance of establishing a microbiologic diagnosis in cases of presumed fungal infection.