It's pretty common for two specialists to have different opinions, despite thousands of dollars of testing.
I have a patient with neuropathic quality foot pain, for example.
A Podiatrist will not back down in stating the foot pain is referred from the patients back.
A Neurosurgeon will not back down in stating the foot pain is coming from the foot, not the back.
It's not so fun for the patient.
It's not so fun for me either.