Table 5.

Types of lateral sinus condition found intraoperatively

Sr. no	Intraoperative type of lateral sinus wall	Status of blood flow and involvement	No. of cases in our series
1	Normal blue sinus wall	Blood flow in sinus verified by needle aspiration	2
2	Dull lustreless sinus wall	Blood could not be aspirated. Soft infected thrombus found in the sinus lumen after opening it. Sinus blood flow encountered after removal of clot	1
3	Thick sinus wall with perisinus granulation	Sinus outline was apparent proximally and distally with/without scanty intrasinus pus, no intrasinus blood flow	2
4	Extensive perisinus granulation with perisinus abscess	Osteitic bone all around the sinus. Sinus outline, indistinguishable. Involvement of transverse sinus proximally and internal jugular vein distally creates difficulty in establishing proximal blood flow	Nil