Parma forward Yann Karamoh scored one and set up another on his San Siro return to help his side earn a 2-2 draw and deny Inter top spot in Serie A.
Juventus dropped points for just the second time this season in its 1-1 draw with Lecce earlier on Saturday but Inter, despite taking the lead, could not take full advantage.
Karamoh, whose loan to Parma from the Nerazzurri is set to become permanent at the end of the season, cancelled out Antonio Candreva's fortuitous opener and set up Gervinho to put Parma ahead in the 30th minute.
Romelu Lukaku equalised early in the second half despite being in an offside position in the build-up - his sixth Serie A goal awarded after a lengthy VAR check - but Inter could not find a winner and remains a point adrift of leader Juve.
No Serie A side had scored more first-half goals this season than Inter prior to kick-off and it was ahead inside 23 minutes - Candreva's half-volley from the edge of the box deflecting off Kastriot Dermaku to leave Luigi Sepe wrong-footed.
The visitor responded in style as Karamoh pounced on a loose pass from Marcelo Brozovic, carried the ball forward and picked out the top-left corner with a stunning strike.
Gervinho put Parma in front four minutes later following another sloppy ball from Brozovic, which Karamoh again profited from by surging forward and picking out his team-mate for a low finish from 10 yards.
Inter was back on level terms six minutes into the second half through Lukaku's close-range finish, the goal allowed to stand despite the Belgian standing in an illegal position when Brozovic played in Candreva to tee him up.
Gervinho was denied by Samir Handanovic and Karamoh also had an effort kept out as Parma refused to give up, but the match finished all square.
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