Shower head arm rusted through

My showerhead arm is rusted through and water is leaking out everywhere. The tube and its thread is through a concrete wall. I have no idea how to repair. I know I'll have to break through the concrete, but not sure if doing so well break the water tube beneath.

Any recommendations before I have to call a plumber?

Update:

I decided to cut through the cement around with a cold chisel to free from the cement a bit.