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In page Atypical trigeminal neuralgia:

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Due to the variability and imprecision of their pain symptoms, ATN or atypical odontalgia patients may be misdiagnosed with atypical facial pain (AFP) or "hypochondriasis", both of which are considered problematic by many practitioners.[5] The term "atypical facial pain" is sometimes assigned to pain which crosses the mid-line of the face or otherwise does not conform to expected boundaries of nerve distributions or characteristics of validated medical entities. As such, AFP is seen to comprise a diagnosis by reduction.[citation needed]