Dural osteoma
Brain stones
revisited—between a rock and a hard place. Dural osteoma. A 53-year-old female who presented with a headache and distant history of head trauma. The FLAIR (a) and MIP-SWI (b) MRI sequences showed an area of signal loss (white arrows) in the right temporal lobe initially thought to represent an enlarged post-traumatic air cell. Subsequent NCECT (c) and 3D reconstruction (d) revealed a solid calcified lesion (black arrow) adherent to the squamous part of the temporal bone. Note the cortical buckling (a), which suggests an extra-axial location. The homogeneously solid calcification (c) suggests a dural osteoma instead of a dural ossification
Dural osteomas are a cause of focal intracranial calcification (colloquially known as brain stones). They are difficult to differentiate from an ossified "burnt out" meningiomas and ossification of the falx. Some reports are actually contradictory , suggesting that at least some lesions have been misclassified.
Rarely, intracranial osteomas are identified without a dural attachment .
