<prompt> Angular vein infection may cause thrombosis of:Cavernous sinusSphenoidal sinusPetrosal sinusSigmoid sinus  <response>: a Cavernous sinusRef. Scott Brown, 8th ed., Vol 1; 965Angular vein from the medial angle of the eye continues as the facial vein which through the deep facial vein communicates with the cavernous sinus through the pterygoid plexus of veins. 