Hybrid imaging, a modality which combines metabolic and anatomical information, has become a key component in the field of oncology. Variations of normal anatomy present on this type of imaging may be misinterpreted as pathology by nuclear physicians. The scans presented in this paper are part of a series which aims to identify and discuss incidental findings and normal variants of anatomy which may be apparent on hybrid imaging. This case of a 74-year-old woman with a history of malignancy highlights the presence and appearance of an azygous lobe and fissure on axial and sagittal images of a 18F-fluorodeoxyglucose positron emission tomography/computed tomography scan. The azygous lobe is a rare normal variant of lung anatomy. Although it is not a pathological finding, it can have medical and surgical implications. Therefore, it is important that nuclear physicians are aware of this variant of lung anatomy in order to prevent misdiagnosis and mismanagement of the patient.
Key words: Incidental findings, lung, positron emission tomography computed tomography, radionuclide imaging
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