Frontal lobe lesions masquerading as psychiatric disturbances

Is Psychiatric Depression a Presenting Neurologic Sign of Meningioma? A Critical Review of the Literature with Causative Etiology

BACKGROUND

Benign meningiomas constitute 80%-90% of all meningiomas and represent the most common type of central nervous system tumor in adults. The vast majority of meningiomas are minimally symptomatic or asymptomatic early in their onset and thereby can often result in delayed diagnosis. Early diagnosis of meningioma is critical, as it can maximize treatment options and improve outcomes and survival. Although seizures and focal neurologic deficits are considered to be the most prevalent symptoms, depression also may be an important and significant sign. A subtle neurologic depression may be an even early presenting sign of meningioma and may precede more traditional presenting symptoms.

METHODS

We performed a comprehensive literature review that analyzes the results of prospective studies and case reports on this topic.

RESULTS

Our findings show evidence to suggest that depression may be correlated with meningioma presentation. Its prevalence is possibly increased with an anterior location of the tumor.

CONCLUSIONS

For patients who exhibit nuances of depression without a history of psychiatric illness, an index of suspicion for meningioma may be warranted.

Diagnostic and Statistical Manual of Mental Disorders, Fourth Edition symptoms of mania: which one(s) result(s) more often from right than left hemisphere lesions?

Previously published single case reports of patients with a unilateral lesion were assembled. After the lesion, each of the 244 cases presented at least one of the Diagnostic and Statistical Manual of Mental Disorders, Fourth Edition (DSM-IV) symptoms of a manic episode, namely, elated or irritable mood, grandiosity, talkativeness, flight of ideas, hyperhedonism, reduced need for sleep, agitation, or distractibility (all optional in DSM-IV). As expected, the subgroup of 59 manic patients had a right hemisphere lesion far more often than a left one. However, this was also true of various sets of the nonmanic cases. Furthermore, elation was not the symptom most strongly associated with lesion side. Elation without mania was not significantly predicted by lesion side. However, talkativeness was strongly predicted by right lesion side whether in manic or nonmanic patients or even when the symptom was the only symptom observed. Agitation was consistently and robustly associated with right lesion side, but not completely distinctly so (it fell short of significance when not accompanied by elation or other symptoms). It is proposed that prevalence of right hemisphere lesions causing mania is primarily related to mental and behavioral disinhibition rather than a shift of mood and that it consists of release of left hemisphere influence.

Psychiatry and the frontal lobes

The frontal lobes of the brain have long been regarded as enigmatic in their function and perhaps should be considered even more so in states of dysfunction. Observed associations between structural lesions and psychiatric symptoms and the demonstration of disturbed function and morphology in the frontal lobes of individuals suffering from major psychiatric disorders have led to increased interest in this brain area. Psychiatrists have been particularly concerned with seeking the aetiogenesis of common diagnostic entities and this article attempts to synthesize the available facts. A brief overview of relevant biological data precedes a description of methods of neuropsychological testing and the clinical features arising from frontal lobe damage. A discussion of the role of the frontal lobes in some aspects of personality function follows. Neuropsychiatric features associated with known frontal lobe pathology are described, prefacing a discussion of those psychiatric conditions where an aetiological role for frontal lobe dysfunction has been proposed.

Physical disorders among emergency psychiatric patients

An examination of patients with physical disorders requiring immediate treatment or investigation was undertaken in the Psychiatric Emergency Service of the Royal Ottawa Hospital and found to comprise 7% of the patient population, or one visit per day. Those with physical problems differed from the rest of the emergency patients in that a greater number were over age 60 and were diagnosed as alcoholic or chronic organic brain syndrome. Socio-demographic characteristics were examined as well. The presenting problem was accurate regarding a physical basis in only two-thirds and the disorder could, in some way, be related to a psychiatric diagnosis in 75% of the patients. Emphasis is placed on the fairly high frequency of immediate physical attention required by these patients who come to the psychiatrist. Consequently, psychiatric assessment and management is not the priority for this group and other skills of the psychiatrist are necessary in treating the patient.

Catatonia with frontal lobe atrophy

A middleaged woman with a four year history of behavioural change including episodes of catatonia is described. Despite a persistently abnormal electroencephalogram, the patient was diagnosed repeatedly as suffering from a primary psychiatric disorder. Neurological examination and psychological testing suggested frontal lobe dysfunction, which was confirmed by the finding of isolated frontal lobe atrophy on computed axial tomography.