Inter's lead at the top of the Serie A table is down to six points with eight games to go after they were held 1-1 at relegation-threatened Fiorentina on Sunday.
Inter took the lead in the first minute thanks to a header by Pio Esposito but Cher Ndour earned the Florence side a share of the spoils with a goal in the closing stages.
Inter have 69 points while second-placed AC Milan have 63 after they beat Torino 3-2 at the San Siro on Saturday.
Champions Napoli are one point further back in third following a 1-0 victory at Cagliari on Friday.
Como continued their drive to qualify for the Champions League for the first time on Sunday, thumping bottom-side Pisa 5-0 to take their points tally up to 57 and consolidate fourth place.
Fifth-placed Juventus have 54 points after being held 1-1 by Sassuolo in Turin on Saturday.
Sixth-placed AS Roma pulled level with Juve on points by beating third-from-bottom Lecce 1-0 at home on Sunday.
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