Left Frontal Lobe Meningioma Causing Secondary Schizophrenia Misdiagnosed for 25 Years

Left Frontal Lobe Meningioma Causing Secondary Schizophrenia Misdiagnosed for 25 Years

João Gama Marques, MDa,b,*

The exclusion of psychosis secondary to a neurosurgical condition is mandatory whenever a psychiatric diagnosis is made. Meningiomas can cause psychiatric symptoms in up to 35% of patients, especially when localized in the frontal lobe1 and in correlation with edema.2 Frontal lobe meningiomas are known to cause not only mood changes3 but also florid psychotic syndromes,4-11 thus they should always be part of the differential diagnosis for both affective and nonaffective psychosis. Unfortunately, many patients receive the diagnosis of primary psychosis (eg, schizophrenia spectrum disorder) without proper exclusion of a brain lesion. Here, the case is presented of a patient who had been labeled for a quarter of a century with the diagnosis of various primary psychotic disorders until the first neuroimaging examination revealed a large-sized left frontal lobe meningioma.

Case Report

A 49-year-old man was admitted to the psychiatric emergency department of a general hospital for aggressive behavior and social isolation secondary to persecutory delusional ideation. His extensive clinical records revealed 15 psychiatric admissions over the last 25 years. There were various episodes of nonaffective (persecutory delusions with auditory pseudohallucinations) and affective psychotic episodes (mania and depression), suggesting a schizophrenia or schizoaffective spectrum disorder. The patient had been on many benzodiazepines, antidepressants, mood stabilizers, and antipsychotics and was successful in occupational therapy. He had lost his father in a workplace accident at 13 years of age and since then became introverted and emotionally dependent on his histrionic mother. He had a family history of stroke (paternal grandmother) and alcoholism and schizophrenia (maternal grandfather and uncle). His blood and urine tests were negative. The psychological assessment documented superior intelligence with intellectual snobbery, learning and memory impairments, and an immature and impulsive personality, with a particular interest in sexual and religious themes. Although 1 electroencephalogram was mildly irregular, no brain scans were included in the hundreds of pages of his clinical file. A routine magnetic resonance imaging (MRI) brain scan (Figure 1) showed a left frontal lobe extra axial expansive lesion with well-defined limits (47 ×— 46 ×— 57 mm) suggestive of cerebral falx meningioma. The patient was referred to the neurosurgery department, and neuropathology confirmed a grade II meningioma. His aggression and social isolation remitted during the next 2 years of postsurgical follow-up, but there was no full remission of previously described (older) psychotic symptoms. Psychopharmacologic treatment was reintroduced with escitalopram 20 mg (morning), clozapine 100 mg (evening), and paliperidone palmitate 350 mg (1 injection every 3 months).

Discussion

For decades, psychiatrists trusted in Schneiderian first-rank symptoms (eg, delusional perceptions and complex hallucinations) as pathognomonic and sufficient for schizophrenia diagnosis.12 Nevertheless, systematic review revealed that those symptoms may lead to 40% of schizophrenia diagnosis failure.13 On the other hand, it is important to remember that these symptoms can occur in many other disorders, especially neurologic conditions.14

Many meningiomas are slow-growing neoplasms.15 Therefore, the patient presented here most likely suffered a sluggish sequence of events involving the local neurocircuits in relation with the compression over the frontal lobes, leading to many different psychiatric symptoms for more than 2 decades, including social isolation and aggressive behavior. In this particular case, we will never know how old the lesion was or if the prognosis would have been different had a brain scan been done earlier.

Unfortunately, this was not the first (or even second) patient to present to this hospital with a serious psychiatric misdiagnosis and no previous brain-imaging examination.16-20 Every case of first-episode psychosis deserves a full medical workup,21,22 and physicians should ask themselves: Why in the age of MRIs is a brain tumor mistaken for a psychiatric illness?23 Awareness of secondary schizophrenia should be raised24,25 to minimize diagnosis errors that may compromise treatment and prognosis.

Published online: February 27, 2020.

Potential conflicts of interest: None.

Funding/support: None.

Patient consent: Permission was obtained from the patient to publish this case report, and information was de-identified to protect anonymity.

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