Relapsing encephalopathy with headache: an unusual presentation of isolated intracranial neurosarcoidosis

Measurement of cerebrospinal fluid ACE level in aseptic meningitis: diagnostic?

Neurosarcoidosis (NS) is a rare disease, affecting only 3%-10% of patients with sarcoidosis. The clinical presentation can be protean and often represents a diagnostic challenge. Cerebrospinal fluid (CSF) ACE level has poor sensitivity, but high specificity for establishing a diagnosis of NS. We present a case of NS in a middle-aged African American woman who presented with dysphagia and dysphonia. An extensive radiological workup was negative for structural brain disease. CSF studies demonstrated lymphocyte predominant pleocytosis with an elevated ACE level. A diagnosis of possible neurosarcoidosis was made. She responded to systemic steroid therapy with complete resolution of her symptoms over the next five months. In the appropriate clinical setting, an elevated CSF ACE level could be of paramount importance for making a diagnosis of NS.

The Protean Neuropsychiatric and Vestibuloauditory Manifestations of Neurosarcoidosis

BACKGROUND

A rare subset of sarcoidosis, neurosarcoidosis, is reported to occur in 5-7% of sarcoid patients and can manifest in a variety of ways. The most common are facial paralysis and optic neuritis, less commonly causing cochleovestibulopathy, blindness, anosmia, and other cranial nerve (CN) palsies. The sensory deficit may be severe and psychiatric symptoms may result from the effects of the disease or steroid treatment. Although MRI-compatible cochlear implants are now available, concerns about the feasibility of recoverable hearing with cochlear implantation in these patients as well as the practical difficulty of disease monitoring due to implant artifact must be considered.

RESULTS

We present 3 recent cases from different institutions. The first is a 39-year-old man with a history of progressively worsening hearing loss, followed by visual loss, delusions, agitation, ataxia, and musical auditory hallucinations, diffuse leptomeningeal enhancement on MRI with a normal serum angiotensin-converting enzyme (ACE) level but elevated cerebrospinal fluid (CSF) ACE levels, suggesting neurosarcoidosis, was treated with corticosteroids, and underwent successful cochlear implantation. The second is a 36-year-old woman with rapid-onset horizontal diplopia, left mixed severe sensorineural hearing loss (SNHL) and tinnitus, diffuse leptomeningeal enhancement on MRI, and progressive palsy of the left CNs IV, VI, VII, IX, X and XI, with altered mental status requiring admission following high-dose intravenous corticosteroids. The third is a 15-year-old boy who presented with sudden, bilateral, profound SNHL, recurrent headaches, and left facial weakness refractory to antivirals, ultimately diagnosed with neurosarcoidosis following an aborted cochlear implantation where diffuse inflammation was found, and histopathology revealed Schaumann bodies; he was treated with methotrexate and later underwent successful cochlear implantation.

CONCLUSIONS

Neurosarcoidosis is an elusive diagnosis and can cause hearing loss and psychiatric symptoms. Cochlear implantation for patients with severe hearing loss should be considered once the diagnosis is confirmed, as it is possible to achieve a successful level of hearing. Psychiatric symptoms can manifest with the onset of neurosarcoidosis, result from CN deficits, or develop as a side effect from long-term, high-dose corticosteroids, and should be monitored carefully in patients with neurosarcoidosis.

Unusual presentation of sarcoidosis: solitary intracranial mass lesion mimicking an intracranial neoplasm: a case report

Sarcoidosis is a multisystem disease of unknown cause and with a worldwide distribution. Involvement of the central nervous system occurs in a relatively small number of patients with sarcoidosis. Isolated neurosarcoidosis without signs of systemic disease however is a rare. In this report, we present an unusual case of neurosarcoidosis with intra cranial mass mimicking radiologically a glioma. Pathological examination revealed intraparenchymatous necrotising granulomatous lesions. After clinicopathological correlation, the diagnosis of a necrotizing cerebral granulomatosis (neurosarcoidosis) with atypical systemic involvement was made. Because of its non-specific clinical presentation and neuroradiological imaging characteristics, intracranial neurosarcoidosis remains a very difficult diagnosis, particularly in the absence of systemic signs of the disease.

Neurosarcoidosis: clinical review of a disorder with challenging inpatient presentations and diagnostic considerations

Neurosarcoidosis is frequently on the differential diagnosis for neurohospitalists. The diagnosis can be challenging due to the wide variety of clinical presentations as well as the limitations of noninvasive diagnostic testing. This article briefly touches on systemic features that may herald suspicion of this disorder and then expands in depth on the neurological clinical presentations. Common patterns of neurological presentations are reviewed and unusual presentations are also included. A discussion of noninvasive testing is undertaken, exploring dilemmas that may be encountered with sensitivity and specificity. Drawing from a broad range of clinical clues and diagnostic data, a systematic approach of pursuing a potential tissue diagnosis is then highlighted. Correctly diagnosing neurosarcoidosis is critical, as treatment with appropriate immunosuppression protocols can then be initiated. Additionally, treatment of refractory disease, the trend toward exploring targeted immunomodulation options, and other therapeutic issues are discussed.

Neurosarcoidosis

OPINION STATEMENT

Neurosarcoidosis can involve either the central nervous system (CNS), the peripheral nervous system (PNS), or both. The clinical manifestations are varied and include cranial neuropathy, aseptic meningitis, hydrocephalus, headache, seizure, neuropsychiatric symptoms, neuroendocrine dysfunction, myelopathy, and peripheral neuropathy. Neurologic problems that develop in sarcoidosis patients should not be assumed to represent neurosarcoidosis, as they are often attributable to another cause. The diagnostic work up of neurosarcoidosis should include an evaluation for potential extra-neural involvement and histologic confirmation of sarcoidosis. If there is no appropriate extra-neurologic organ for biopsy, a biopsy from involved neural tissue needs to be considered. Biopsy of the dura and leptomeninges is less invasive than biopsy of the brain or spinal cord parenchyma. Gadolinium-enhanced magnetic resonance imaging (MRI) of the brain and spinal cord is the most sensitive test for neurosarcoidosis, while the diagnostic specificity of cerebrospinal fluid (CSF) analysis is limited. Corticosteroids are the mainstay of treatment for neurosarcoidosis. In general, oral corticosteroids are used for mild to moderate cases, while high-dose intravenous methylprednisolone is used in severe cases or refractory cases that fail to respond to oral corticosteroids. Immunomodulating and cytotoxic agents are often required for steroid-refractory neurosarcoidosis or for patients who develop significant corticosteroid adverse effects. Methotrexate is used as a first-line corticosteroid sparing agent. Tumor necrosis factor-alpha inhibitors, including infliximab, are effective for refractory neurosarcoidosis. Cyclophosphamide is also used for refractory neurosarcoidosis patients, but, because of the drug's significant toxicity, it is usually reserved for severe cases that have failed oral therapies when tumor necrosis factor alpha antagonists cannot be obtained. In addition to anti-granulomatous therapy, treatment is frequently required for neurosarcoidosis-associated conditions, such as epilepsy and neuroendocrine dysfunction. Surgical intervention is indicated for life threatening complications such as hydrocephalus, steroid-refractory spinal cord compression, or mass lesions causing increased intracranial pressure.

Neurosarcoidosis: Clinical manifestations, diagnosis and treatment

Sarcoidosis is an idiopathic granulomatous disease affecting multiple organs. Neurosarcoidosis, involving the central and/or peripheral nervous systems, is a relatively rare form of sarcoidosis. Its clinical manifestations include cranial neuropathies, meningitis, neuroendocrinological dysfunction, hydrocephalus, seizures, neuropsychiatric symptoms, myelopathy and neuropathies. The diagnosis is problematic, especially when occurring as an isolated form without other organ involvement. Distinguishing neurosarcoidosis from other granulomatous diseases and multiple sclerosis is especially important. Although biopsy of neural tissue is the gold standard for the diagnosis of neurosarcoidosis, this is often not practical and the diagnosis must be inferred though other tests, often coupled with biopsy of extraneural organs. Corticosteroids and other immuno-suppressants are frequently used for the treatment of neurosarcoidosis. This article reviews the epidemiology, pathogenesis, pathology, clinical features, diagnosis, diagnostic tests, diagnostic criteria, and therapy of neurosarcoidosis.