Angelino scored a 92 minute equaliser as Roma came from behind to salvage a 1-1 draw with Napoli at the Stadio Olimpico as they extended their unbeaten SA streak to seven matches in the process.
Coming off the back of three wins from their last four SA games, Roma knew a positive result against league leaders Napoli would see them close in on the top six.
It was Napoli, though, who had the better of a cagey opening 20 minutes as Scott McTominay saw a close-range effort comfortably saved by Mile Svilar.
Antonio Conte's side continued to stamp their authority on proceedings and a breakthrough duly arrived in the 29th minute as former Roma player Leonardo Spinazzola raced onto Juan Jesus' long ball, lifting a magnificent finish over the onrushing Svilar.
The hosts then pursued an equaliser before half-time, but Alex Meret was equal to a smart save from Evan Ndicka's glanced header to ensure Gli Azzurri went into half-time with their narrow lead intact.
Unbeaten in nine of the last 10 head-to-head's (W6, D3, L1), visitors dominated the opening exchanges of the second half too, with McTominay blazing wastefully over the bar after good work from Romelu Lukaku.
That served as a warning for Claudio Ranieri’s men, who came within inches of a leveller when Leandro Paredes’ curled free-kick struck the outside of the post.
The contest remained tantalisingly poised heading into the final quarter-hour, with Paulo Dybala coming off the bench for the hosts in the hope of salvaging a late point.
Napoli seemed set to do enough to hold off Atalanta going into deep added time but, out of absolutely nowhere, a perfectly-timed crossfield pass from Alexis Saelemaekers saw Angelino volley with exquisite venom into the far corner with basically the final kick of the match.
The result extends Roma's unbeaten home run to eight matches across all competitions (W7, D1), while Napoli miss the chance to go five points clear at the Serie A summit as their seven-match winning streak comes to an end.