Invasive aspergillosis has been increasingly recognized as causing signific
ant morbidity and mortality in immunocompromised patients but has never bee
n diagnosed by fine-needle thyroid aspiration. A 24-year-old female with sy
stemic lupus erythematosus presented with cough, shortness of breath, and f
ever of unknown origin unresponsive to broad-spectrum antibiotics. History
and physical examination failed to indicate a source of infection. An In-11
1 white blood cell scan showed thyroid localization. Physical examination r
evealed a multinodular goiter with a left dominant nodule. Fine-needle aspi
ration biopsy of a thyroid nodule revealed branching hyphae suggestive of A
spergillus sp. Despite immediate and aggressive treatment with amphotericin
B and fluconazole, the patient died of overwhelming infection.