Ireland's Sam Bennett won stage seven of the Giro d'Italia as Britain's Simon Yates retained the pink jersey.
"I feel relieved", said Bennett afterwards.
After a gruelling final climb along a 150m stretch of road, Aru crossed the line - under the shadow of the Etna Astrophysical Observatory - with the main peloton, just 26 seconds behind race victor Johan Eseban Chavez (Mitchelton Scott).
Bennett's one minute eleven seconds behind the overall leader Simon Yates of England but believes that difference could be much less had he ridden a smarter race. "I still need to get some time on Tom Dumoulin and some other guys who are better time trialists than me". "I looked across the road and everyone was looking at each other".
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If the Collegium sends it back a second time, as in the present case, the Centre is bound to accept the recommendation. The next meeting will be held on May 16 evening.
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"With a bit more care we would have scored on the break", said the former Manchester United manager. Which is more than one can say for the quality of the football in east London .
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The Adelaide rider had led by one second for four days and he dropped to sixth overall.
Team Sky's Chris Froome, aiming to win a third successive grand tour, remains eighth, 70 seconds behind his race-leading compatriot.
With two mountain stages to come at the weekend, Yates's domestiques were given a relatively easy day as the sprinters' teams took responsibility for controlling the gap to the break as Quick-Step Floors and Wilier Triestina-Selle Italia dominated the front of the bunch.
"He'd been up the road all day and he deserved it". "I had to freewheel for a moment because I had gone to early, but when the time was right I really took it on". I think also I'm in the king of the mountains jersey - it's like a dream. Interestingly, Roche took the Maglia Rosa for good in 1987 at Sappada where the Giro returns this year for the first time, on May 20, for the 15th stage.
The only force he couldn't match was the superb showing from the Mitchelton-Scott team, who achieved a rare 1-2 finish atop the mountainous finish.