This wasn't the dreaded radiator neck problem...this is the smaller tube that goes to the coolant tank...the radiator hose attached to the neck goes to the coolant pump.
J.HIDALGO is VERY lucky that the fitting wasn't damaged...otherwise it would be "new radiator time"...like the rest of us.
By the way, J.HIDALGO, if you still have the OEM radiator, start saving up for a new one...you WILL be replacing it eventually. As chicago124 mentioned, the radiator neck is a common failure with W124s.
2009 ML350 (84K) - Family vehicle
2001 CLK430 Cabriolet (71K) - Wife's car
2005 BMW 645CI (124K) - My daily driver
2012 Mustang V6 (60K) - Daughter's car