Serinity
By all means this is an emergency,my hubby had the same and can be fatal if the tumor is not shrunk immediately.
There are web sites that will tell you all about this.
My hubby has SCLC also and when his started he had venous distension on his chest(which looked like a hundred spider veins),swelling of his face,swelling around his eyes and distention of his juglar vein in his neck.
Urge the Dr to take an agressive approach to this!!!
God Bless you I will pray for your mom.
Karen44