Ces radiol. 2014, 68(1):61-63

Fibular head enchondroma mimics a solitary malignant melanoma metastasis on 18F-FDG PET/CT imagingCase report

Jiří Doležal1, Martin Slanina2
1 Oddělení nukleární medicíny FN, Hradec Králové
2 Radiologická klinika LF UK a FN, Hradec Králové

Aim: To present a rare case report of the fibular head enchondroma mimics a solitary malignant melanoma metastasis on 18F-FDG PET/CT imaging.

Method: The 49-year-old woman with positive history of the metastatic malignant melanoma after treatment underwent 18F-FDG PET/CT. The whole body PET/CT scan was obtained 60 minutes after intravenous injection of 18F-FDG (386 MBq). The PET scan acquisition time was 2.5 minutes per bed position for whole body imaging and fourteen bed positions were necessary. Contrast-enhanced CT (venous phase) provided both full CT evaluation (including intravenous and oral contrast) and PET attenuation correction.

Results: The examination revealed 18F-FDG avid bone lytic lesion with the mild sclerotic border in the left fibular head. The PET/CT finding was suspected for solitary melanoma metastasis. The patient underwent surgery and enchondroma was proven by histopathology.

Conclusion: Benign enchondroma shows increased 18F-FDG uptake in bone lesion and can mimic solitary malignant melanoma metastasis on PET/CT imaging and can cause potential pitfall in the PET/CT evaluation.

Keywords: enchondroma, melanoma, PET/CT, 18F-FDG
Grants and funding:

Podpořeno MZ ČR - RVO (FNHK).

Accepted: December 15, 2013; Published: March 1, 2014  Show citation

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Doležal J, Slanina M. Fibular head enchondroma mimics a solitary malignant melanoma metastasis on 18F-FDG PET/CT imaging. Ces radiol. 2014;68(1):61-63.
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