Highest aggregate score in a Champions League semi final tie

Highest aggregate score in a Champions League semi final tie
Who
A.S. Roma, Liverpool F.C.
What
13 total number
Where
Italy (Rome)
When
02 May 2018

The highest aggregate score in a Champions League semi final tie is 13, achieved by Liverpool F.C. (UK) and A.S. Roma (Italy) from the two legs of the tie on 24 April 2018 and 2 May 2018.

The final score between the two teams was 7-6 to Liverpool.

Liverpool won the first leg at Anfield 5-2, the second leg was won by Roma 4-2 at the Stadio Olimpico.