Neuropsychiatry and Pituitary Disease: An Overview

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Abstract
It has been recognized for some time that psychiatric symptoms, such as depression, anxiety, and behavioral alterations, may occur in patients who have pituitary disease. From other research focused on endocrine abnormalities seen in patients with psychiatric illness, it is understood that there is a significant interrelationship between the endocrine system and mental health. More recent research focusing on neural circuits in the brain and the impact of alterations in neurotransmission and neurohormonal modulation has shown that the prefrontal cortex can be affected by perturbations in functioning occurring in distant sites. Such is the situation with the hypothalamic-pituitary axis. Through its rich connections with other limbic structures, the hypothalamic-pituitary axis may affect the behavioral control exerted by the prefrontal cortex, causing mood and personality alterations. In the more severe cases, an apathy syndrome may develop which must be carefully differentiated from depression and other cognitive disorders. This report will review: (1) the neuroanatomical components that cause the behavioral changes observed in many patients with pituitary disease; (2) the current concept of apathy syndrome; (3) the differentiation of apathy syndrome from major depression; (4) the underlying neurobiology of apathy, and (5) potential treatments.