Galaxy NGC 4485, located some 25 million light years from Earth in the constellation Canes Venatici, apparently avoided a direct hit during an encounter with a larger galaxy millions of years ago, a glancing blow that triggered a firestorm of chaotic starbirth on one side and leaving the other side relatively intact. Even so, the seemingly intact region shows signs of a previous spiral structure, an indication the galaxy was evolving normally in the past. The offending galaxy in the apparent hit and run is NGC 4490, out of view in this image. The two galaxies are now separated by about 24,000 light years.
For context, here is a wide view of the two galaxies:
And here is a view of NGC 4490 from the Hubble Space Telescope: