Mutant Tomato

My Costoluto Genovese tomato has a large mutant flower cluster where the growing tip of the main stem shoud be. I think this is called fasciation. There are conflicting views on what causes this, genetic mutation or a virus. Most views lean towards a mutation. I'm going to take a risk that it is a mutation, leave the plants in place and simply chop of the mutant, and hence to top of the main stem, to encourage the side shoots. Hopefully all will be well.