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Figure 1: CT venogram of the head. The white arrow indicates the right sigmoid sinus diverticulum (a). Noncontrasted axial CT of the temporal bone, displaying both for comparison. There is opacification of the right mastoid air cells. The white arrow indicates bone erosion of the right temporal bone at the site of the sigmoid sinus diverticulum. The black arrow indicates the corresponding area of the normal left sigmoid sinus (b). Noncontrasted CT of the right temporal bone. The white arrow indicates opacification of the middle ear cavity (c)

Figure 1: CT venogram of the head. The white arrow indicates the right sigmoid sinus diverticulum (a). Noncontrasted axial CT of the temporal bone, displaying both for comparison. There is opacification of the right mastoid air cells. The white arrow indicates bone erosion of the right temporal bone at the site of the sigmoid sinus diverticulum. The black arrow indicates the corresponding area of the normal left sigmoid sinus (b). Noncontrasted CT of the right temporal bone. The white arrow indicates opacification of the middle ear cavity (c)