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. 2001 Jun;22(6):1186–1193.

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fig 4. — Case 4.

A, Axial HRCT shows anterior (double arrows) and posterior (large arrow) PSS sulcus of the temporal bone. The mastoid portion of the facial canal is enlarged (arrowheads).

B, MR venography shows absence of the right transverse sinus. A large left contralateral transverse sinus is present with flow signals consistent with the superior petrosal sinus (arrow), pterygoid plexus (double arrows), transpetrous vein (arrowhead) and PPS (double arrowheads). Enlargement of the mastoid portion of the facial canal relates to an excessively developed facial vein (not shown). Note the presence of hydrocephalus and “kissing carotid arteries.”