False-Positive PET Scan in a Patient With Lipoid Pneumonia Simulating Lung Cancer

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Abstract

Purpose:

Lipoid pneumonia usually presents with alveolar infiltrates or as a nonresolving process. We report a case of lipoid pneumonia that presented as a solitary pulmonary nodule and had a high standard uptake value on PET scan, thereby mimicking a malignant process. This case highlights the presence of false-positive PET imaging in a patient with lipoid pneumonia and Mycobacterium chelonae infection.

Materials and Methods:

The patient was examined using CT scanning. The nodule was further investigated with a PET scan using F-18 FDG and the standard uptake value was determined.

Results:

Histopathology following removal of the nodule confirmed the diagnosis of lipoid pneumonia, and the bronchoalveolar lavage (BAL) was reported as M. chelonae, a rapidly growing mycobacterium (RGM).

Conclusion:

Lipoid pneumonia can present as a PET-positive lung nodule and should be considered in the differential diagnosis and workup of a solitary pulmonary nodule.

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