Case of pulmonary cryptococcosis mimicking hematogeneous metastases in an immunocompetent patient: value of absent 18F-fluorodeoxyglucose uptake on positron emission tomography/CT scan

Korean J Radiol. 2013 May-Jun;14(3):540-3. doi: 10.3348/kjr.2013.14.3.540. Epub 2013 May 2.

Abstract

The radiologic appearance of multiple discrete pulmonary nodules in immunocompetent patients, with cryptococcal infection, has been rarely described. We describe a case of pulmonary cryptococcosis, presenting with bilaterally and randomly distributed nodules on a computed tomography, mimicking hematogeneous metastases. Positron emission tomography does not demonstrate 18F-fluorodeoxyglucose (FDG) uptake, suggesting a low probability for malignancy, which is a crucial piece of information for clinicians when making a management decision. We find the absence of FDG uptake correlates with the pathologic finding of an infectious nodule, composed of fibrosis and necrosis.

Keywords: Cryptococcosis; Multiple pulmonary nodules; Neoplasm metastasis; Positron emission tomography.

Publication types

  • Case Reports

MeSH terms

  • Cryptococcosis / diagnostic imaging*
  • Cryptococcosis / metabolism
  • Fluorodeoxyglucose F18* / pharmacokinetics
  • Humans
  • Immunocompetence
  • Lung Diseases, Fungal / diagnostic imaging*
  • Lung Diseases, Fungal / metabolism
  • Lung Neoplasms / diagnostic imaging
  • Male
  • Middle Aged
  • Multimodal Imaging / methods*
  • Multiple Pulmonary Nodules / diagnostic imaging
  • Positron-Emission Tomography / methods*
  • Radiopharmaceuticals* / pharmacokinetics
  • Tomography, X-Ray Computed / methods*

Substances

  • Radiopharmaceuticals
  • Fluorodeoxyglucose F18