Leinster extended their lead at the top at the top of the Pro12 table with victory over Aironi in Viadana.
Three Ian Madigan penalties helped Leinster lead 9-0 at half-time, but Naas Olivier and Luciano Orquera kicked penalties to reduce Aironi's deficit.
Madigan knocked over two further penalties before Noel Reid scored the only try of the game in the 75th minute, converted by Madigan.
Leinster are now 14 points ahead of Ospreys, who were beaten by Glasgow.
Victory saw Leinster equal Munster's tournament record of 14 games unbeaten, set last year, while Aironi remain rooted to the foot of the table with just three wins in 16 games.
Madigan, the 22-year-old, ended with 17 points, the last of which came when he converted Reid's interception try.
Aironi: G Toniolatti, R Pavan, R Quartaroli, G Pizarro, S Sinoti; N Olivier, T Tebaldi, J Sole, S Favaro, N Cattina, C Del Fava, G Biagi, L Romano, R Santamaria (cpt), M Aguero.
Replacements: F Ongaro for Santamaria (78), A De Marchi fro Aguero (50), S Perugini for Romano (50), L Redolfini, F Ferrarini for Del Fava (24), T Keats for Tebaldi (54), L Orquera for Olivier (54),G Pavan for Pizarro (69).
Leinster: L Fitzgerald, A Conway, E O'Malley, B Macken, F Carr, I Madigan, I Boss; H van der Merwe, R Strauss, N White, D Browne, D Toner, K McLaughlin, S Jennings (cpt), R Ruddock.
Replacements: A Dundon for Strauss (75), J McGrath for van der Merwe (72), J Hagan for White (63), L Auva'a for Ruddock 54), D Ryan for Jennings (60), J Cooney for Boss (76), N Reid for Macken (62), I Nacewa, D Hudson for Carr (74).