Incidental findings and normal variants on hybrid imaging: falx cerebri ossification

Abstract

The images presented in this paper are part of a series which aims to highlight anatomical variants and incidental findings which may be placed on hybrid imaging. The current images show the incidental finding of falx cerebri ossification which has been evident on 18F-sodium fluoride positron emission tomography/computed tomography (CT) scans of a 45-year-old female with breast cancer and a 61-year-old male with known prostate cancer. The falx cerebri is a midline fold of the dura mater which may become ossified in some patients. This finding can have varying appearances on CT scans due to location, size, extent, and pattern of ossification. Physicians must be able to identify this as an incidental finding rather than a pathological lesion in order to avoid misinterpretation.