Not everyone in the business will agree with this distinction.
The NTSB does, though.
Statement today:
"The NTSB has an investigator on the scene at Dallas-Fort Worth International Airport inspecting and documenting the engine, an International Aero Engines (IAE) V2500, which has now been removed from the airplane.
As a result of the initial inspection, it was determined that the engine failure was contained, meaning it did not penetrate the engine casing."