"The term pathognomonic in radiology, as well as clinical medicine in general, refers to a finding or a sign that is only found in a single specific condition or specific group of conditions, i.e. the finding has 100% specificity. Thus, by implication, a pathognomonic finding cannot and does not have a differential diagnosis."
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"Examples"
"It does not imply anything about the sensitivity of the finding; indeed, the finding may be rare, and therefore, its absence cannot be taken as a comment on the likelihood of that condition occurring."