What is up with this oak tree?

[maybelateron]

This oak looks in vigorous health looking at the crown. The owner recently noticed some cracking and lifting of the bark, and in recent weeks it has extended upwards. It does not go higher than 4ft above ground. Percussion with hammer reveals nothing other than the fact that the bark in the visibly affected area has lifted. There is no smell to note, and the lowest part of the area almost looks like callous formation at the edge. The tree is in a position where it would land on his house and/it garage if it failed. My feeling is watch, wait and see, but in view of its potential risk I have suggested he get a proper assessment done. He is wanting to sell his house, so this may be an issue for him.

[Eric42]

Possibly Acute Oak Decline (AOD)

 

There is a good description of the symptoms  here

[Sviatoslav Tulin]

Seen exactly same thing today,I give advice keep it for a while ,as tree look healthy and nice in every other aspect.Googling this AOD now .Thanks for info.