HI! acute intracranial conditions refer to several pathological condition like meningitis, encephalitis, brain abcess, intracranial hemorrhage
, acute cerebral edema, contusion, venous sinus thrombosis
Pan sinusitis means inflammation of the para nasal sinuses which are air filled spaces in bone of skull and face due to infection either viral, bacterial or fungal.
As you have complained about seizure with history of flu with pan sinusitis, then i want to tell you that flu involve inflammation of upper respiratory tract which can then lead to inflammation of the para nasal sinuses which can then lead to intracranial involvement directly leading to meningitis, encephalitis or even brain abcess due to secondary bacterial infection or it can lead to lateral sinus thrombosis
through acute middle ear infection(acute otitis media).Seizure is mainly caused by mass effect in the cranium which may be due to several causes as mentioned above.
To reach the proper diagnosis you should go for biochemical cytological and culture examination of CSF,routine blood examination including TLC, DLC,Hb, platelets count and then you should follow your neurologist
for the proper management and later on you can also consult an ENT specialist
for the prevention of sinusitis in future.