Key result
3-phase bone scan fortuitously detects a lower extremity pseudoaneurysm showing early uptake and delayed photopenia.
Case Report (n=1)
Nuclear medicine practitioners should consider benign vascular lesions like pseudoaneurysms in the differential diagnosis of abnormal 3-phase bone scans showing characteristic early increased activity and delayed photopenia.
Alerts clinicians to pseudoaneurysms as mimics on 3-phase bone scans; case report leaves open pattern specificity without confirmatory imaging.
We report the diagnosis of an unsuspected pseudoaneurysm in the lower extremity when 3-phase bone scan was used to evaluate a presumed malignancy. We confirmed the diagnosis with duplex ultrasonography and angiography. Although the primary diagnostic modality for detection of pseudoaneurysm remains duplex sonography, the nuclear medicine practitioner should be vigilant for characteristic presentation of a pseudoaneurysm on a 3-phase bone scan, an area of increased radiotracer activity on blood-flow and blood-pool images that becomes a photopenic area on delayed images. This also underscores the need to consider benign vascular lesions in the differential diagnosis of abnormal 3-phase bone scans for presumed tumors.
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Çoşkun et al. (2005) conducted a case report in Pseudoaneurysm (n=1). 3-phase bone scan was evaluated on Detection of pseudoaneurysm. A 3-phase bone scan fortuitously detected a lower extremity pseudoaneurysm, presenting as increased radiotracer activity on early images that became photopenic on delayed images.
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