A 16-year-old girl who had just been savagely slashed in the neck made a desperate, final call to 911 before she bled to death on a Brooklyn street corner yesterday, police said.

Tragic Kyanna Thomas was attacked at around 3 a.m. at the corner of MacDougal Street and Saratoga Avenue in Bedford-Stuyvesant after sneaking out of the house while visiting her aunt, cops and relatives said.

The girl, who lived in Rosedale, Queens, then managed to call 911 before succumbing.