Related conditions Schizotypal disorder

Schizotypal disorder is described in the ICD-10 as a disorder characterized by eccentric behaviour and anomalies of thinking and affect which resemble those seen in schizophrenia, though no definite and characteristic schizophrenic anomalies occur at any stage. The symptoms may include a cold or inappropriate affect; anhedonia; odd or eccentric behaviour; a tendency to social withdrawal; paranoid or bizarre ideas not amounting to true delusions; obsessive ruminations; thought disorder and perceptual disturbances; occasional transient quasi-psychotic episodes with intense illusions, auditory or other hallucinations, and delusion-like ideas, usually occurring without external provocation. There is no definite onset and evolution and course are usually those of a personality disorder.

Again, schizotypal disorder is not a diagnosis frequently used in UK clinical practice, in my experience. The ICD-10 avers that it excludes 'schizoid personality disorder', but does not give clear instructions as to how this disorder is to be differentiated. In practice, patients with the characteristics described would probably be regarded as having mild schizophrenia.

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