Büch exhibited pseudologia fantastica, uttering many complete falsehoods about his life.

Pseudologia fantastica is a term applied by psychiatrists to the behavior of habitual or compulsive lying.

He may have suffered from pseudologia fantastica; for example, he claimed to have founded a political party.

The defining characteristics of pseudologia fantastica are:

She denied lying on purpose about her diseases and stated that she suffered from delusions and medical condition called pseudologia fantastica.

Pseudologia fantastica may also present as false memory syndrome, where the sufferer genuinely believes that fictitious events have taken place, regardless that these events are fantasies.

Pseudologia fantastica is a condition in which a person grossly exaggerates his symptoms or even tells a lie about his symptoms in order to get medical attention .

The most blatant lying is found in the condition called "pseudologia fantastica," in which a person concocts a stream of fictitious tales about his past, many with a small kernel of truth, all self-aggrandizing.

They present shocking but plausible clinical pictures; they have wildly dramatic histories (pseudologia fantastica, in the trade); they are eager for risky diagnostic procedures and exploratory surgeries, and they depart in high dudgeon upon discovery.