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Case 1: Eight-year-old girl with crouzonoid features, acanthosis nigricans, and FGFR3 ala391glu mutation.
A, Helical CT shows bilateral JFA (arrows) and a large left mastoid emissary foramen (arrowheads).
B, Axial collapsed maximum intensity projection (MIP) from 3D TOF MRV (53/6.9/1 [TR/TE/excitations]) reveals atresia of the right transverse and sigmoid sinuses and the both internal JV (arrowheads). Large occipitomastoid EV arise from the left transverse and sigmoid sinuses (arrows).
