An Anatomical Computed Tomography Study of the Falx Cerebri Ossification Patterns

The falx cerebri (FC) corresponds to the invagination of the meningeal dural layer into the longitudinal fissure between the two cerebral hemispheres. Infrequently, the FC ossifies, forming an extra bone deposition, giving the impression of "supernumerary" bone. The present study aimed to investigate the presence of FC ossification in a large sample of the Greek population. Falx cerebri ossification was identified in 18 patients (18/669, 2.69%). Thirteen cases (13/669, 1.94%) presented with a single bone deposition (single focus) due to the FC ossification. Moreover, 5 cases (5/669, 0.75%) had 2 foci of bone (ectopic) deposition due to the FC ossification. One patient (1/669, 0.15%) had FC ossification and coexisted sphenoid sinus pneumatization. Falx cerebri ossification is generally found incidentally during routine head imaging and has not been linked to significant clinical implications.