Thanks for your query.
Left cornual occlusion means that connection between uterus
and left fallopian tube
has been blocked.It may occur due to infection,endometriosis
,dried secretions or mucus in the tube or scar etc.Pseudo occlusion or false occlusion may be there due to spasm, inadequate pressure, mucus in the tube and other causes.
If its a true occlusion of left cornu then the sperm cant travel to left fallopian tube and fertilise the ovum in left fallopian tube.But you wont have problem in becoming pregnant because your right fallopian tube in patent and good.
You should consult your doctor with the HSG
report for finding out the cause of cornual occlusion and treat likewise.