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Fang T, Wu W, He X, Liang Y, Lin Q, Dai K, Wang S, Peng F, Jiang Y. Clinical characteristics of overlapping syndrome in patients with GFAP-IgG and MOG-IgG: a case series of 8 patients and literature review. J Neurol 2024:10.1007/s00415-024-12633-5. [PMID: 39190107 DOI: 10.1007/s00415-024-12633-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2024] [Revised: 08/08/2024] [Accepted: 08/09/2024] [Indexed: 08/28/2024]
Abstract
OBJECTIVE The overlapping syndrome of anti-GFAP and anti-MOG antibodies is extremely rare. This retrospective study reports 8 adult cases of the GFAP-MOG overlapping syndrome. METHODS We reviewed the clinical characteristics of 8 adult patients with the GFAP-MOG overlapping syndrome from Jan 2019 and Sep 2023 at the Third Affiliated Hospital, Sun Yat-sen University. Moreover, we searched the literature and included all case reports with this overlapping syndrome since 2018 on PubMed. RESULTS The predominant clinical syndrome was meningoencephalomyelitis (5/8), followed by meningoencephalitis (2/8), and myelitis (1/8). Five patients had a flu-like prodromal symptom or diarrhea. No neoplasms were found in these patients. Regarding brain MRI, T2-weighted/fluid-attenuated inversion recovery hyperintensities were in 7 patients and leptomeningeal enhancement was in 4 patients. However, only one patient had periventricular radial linear enhancement. Besides, two patients had large space-occupying lesions. For spinal MRI, T2-hyperintensities were observed in 4 patients, in which 3 patients had longitudinally extensive lesions. All patients were treated with immunotherapy, the median follow-up period was 18 months (range, 3-36 months). Three patients presented relapses during the follow-up, but all cases recovered to mRS scores ≤ 2 at last follow-up. In addition, we also reviewed 14 cases (including 7 adults and 7 children) with this overlapping syndrome by literature review. CONCLUSION Our findings provide data to understand the clinical features and prognosis of the GFAP-MOG overlapping syndrome. Recognizing this overlapping syndrome will expand our knowledge, allowing for better management of these patients.
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Affiliation(s)
- Ting Fang
- Department of Neurology, The Third Affiliated Hospital of Sun Yat-Sen University, 600# Tianhe Road, Guangzhou, 510630, Guangdong Province, China
- Department of Neurology, Shantou Central Hospital, 114# Waima Road, Shantou, 515031, Guangdong Province, China
| | - Weijuan Wu
- Department of Neurology, Sanshui District People's Hospital, Sanshui, Foshan, 528100, Guangdong Province, China
| | - Xinjie He
- Department of Cardiology, Shantou Central Hospital, 114# Waima Road, Shantou, 515031, Guangdong Province, China
| | - Yuting Liang
- Department of Neurology, The Third Affiliated Hospital of Sun Yat-Sen University, Yuedong Hospital, Meizhou, 514799, Guangdong Province, China
| | - Qi Lin
- Department of Neurology, Shantou Central Hospital, 114# Waima Road, Shantou, 515031, Guangdong Province, China
| | - Kai Dai
- Department of Neurology, The Third Affiliated Hospital of Sun Yat-Sen University, 600# Tianhe Road, Guangzhou, 510630, Guangdong Province, China
| | - Siguang Wang
- Department of Neurology, The Third Affiliated Hospital of Sun Yat-Sen University, 600# Tianhe Road, Guangzhou, 510630, Guangdong Province, China
| | - Fuhua Peng
- Department of Neurology, The Third Affiliated Hospital of Sun Yat-Sen University, 600# Tianhe Road, Guangzhou, 510630, Guangdong Province, China.
| | - Ying Jiang
- Department of Neurology, The Third Affiliated Hospital of Sun Yat-Sen University, 600# Tianhe Road, Guangzhou, 510630, Guangdong Province, China.
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Du BQ, Lai QL, Li EC, Cai MT, Fang GL, Shen CH, Zhang YX, Ding MP. Myelin oligodendrocyte glycoprotein antibody and N-methyl-d-aspartate receptor antibody overlapping syndrome: insights from the recent case reports. Clin Exp Immunol 2024; 215:27-36. [PMID: 37724585 PMCID: PMC10776248 DOI: 10.1093/cei/uxad109] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2023] [Revised: 08/23/2023] [Accepted: 09/15/2023] [Indexed: 09/21/2023] Open
Abstract
The overlapping of two or more types of neural autoantibodies in one patient has increasingly been documented in recent years. The coexistence of myelin oligodendrocyte glycoprotein (MOG) and N-methyl-d-aspartate receptor (NMDAR) antibodies is most common, which leads to a unique condition known as the MOG antibody and NMDAR antibody overlapping syndrome (MNOS). Here, we have reviewed the pathogenesis, clinical manifestations, paraclinical features, and treatment of MNOS. Forty-nine patients with MNOS were included in this study. They were young males with a median onset age of 23 years. No tumors were observed in the patients, and 24 of them reported prodromal symptoms. The most common clinical presentations were psychiatric symptoms (35/49) and seizures (25/49). Abnormalities on magnetic resonance imaging involved the brainstem (11/49), cerebellum (9/49), and parietal lobe (9/49). Most patients mostly responded to immunotherapy and had a good long-term prognosis. However, the overall recurrence rate of MNOS was higher than that of mono antibody-positive diseases. The existence of concurrent NMDAR antibodies should be suspected in patients with MOG antibody-associated disease having psychiatric symptoms, seizures, movement disorders, or autonomic dysfunction. Similarly, serum MOG antibody testing should be performed when patients with anti-NMDAR encephalitis present with atypical clinical manifestations, such as visual impairment and limb weakness, and neuroradiological findings, such as optic nerve, spinal cord, or infratentorial involvement or meningeal enhancement. Early detection of the syndrome and prompt treatment can be beneficial for these patients, and maintenance immunosuppressive therapy is recommended due to the high overall recurrence rate of the syndrome.
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Affiliation(s)
- Bing-Qing Du
- Department of Neurology, Second Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou, China
| | - Qi-Lun Lai
- Department of Neurology, Zhejiang Hospital, Hangzhou, China
| | - Er-Chuang Li
- Department of Neurology, Second Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou, China
| | - Meng-Ting Cai
- Department of Neurology, Second Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou, China
| | - Gao-Li Fang
- Department of Neurology, Zhejiang Chinese Medicine and Western Medicine Integrated Hospital, Hangzhou, China
| | - Chun-Hong Shen
- Department of Neurology, Second Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou, China
| | - Yin-Xi Zhang
- Department of Neurology, Second Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou, China
| | - Mei-Ping Ding
- Department of Neurology, Second Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou, China
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Pan D, Gu J, Zeng C, Chen L. A Mild Phenotype of Overlapping Syndrome With Myelin-Oligodendrocyte Glycoprotein and Glial Fibrillary Acidic Protein Immunoglobulin G: Mimicking Viral Meningitis in a Patient. Neurologist 2023:00127893-990000000-00117. [PMID: 38126409 DOI: 10.1097/nrl.0000000000000547] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2023]
Abstract
INTRODUCTION Glial fibrillary acidic protein (GFAP) astrocytopathy, an autoimmune central nervous system disorder characterized by the development of immunoglobulin G reactive with GFAP, has received growing attention in recent years. It is documented that GFAP-immunoglobulin G and other autoantibodies can be both detected in some patients. However, the coexistence of anti-myelin-oligodendrocyte glycoprotein (MOG) and GFAP antibodies is rarely reported. CASE A 45-year-old man presented with headache, fever, backache, dysuria, tremble of hands, numbness of lower limbs, without diplopia, decreased vision, or other manifestations of optic neuritis. He was initially diagnosed with viral meningitis. After antiviral therapy, his headache, fever, and dysuria were improved, but the tremble of his upper limbs and numbness of his lower limbs still existed. A lumbar puncture was further performed and found both anti-GFAP and anti-MOG antibodies in the cerebrospinal fluid. No evidence of other immune disorders or infectious diseases was revealed. Meanwhile, a magnetic resonance scan showed enhancement of spinal pia mater in cervical, thoracic, and lumbar segments. He was then treated with immunoglobulin (intravenous immunoglobulin) therapy (25 g for 5 d), and steroid pulse therapy (methylprednisolone, 1 g for 5 d), followed by a gradual tapering of oral prednisolone. CONCLUSION We reported a case of overlapping anti-GFAP and anti-MOG antibody-associated syndrome. This case enriches our understanding of the clinical manifestations of overlapping syndrome and expands the spectrum of this disorder.
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Affiliation(s)
- Danmei Pan
- Department of Infectious Medicine, Ningbo No. 2 Hospital, China
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Gu M, Mo X, Fang Z, Zhang H, Lu W, Shen X, Yang L, Wang W. Characteristics of aseptic meningitis-like attack-an underestimated phenotype of myelin oligodendrocyte glycoprotein antibody-associated disease. Mult Scler Relat Disord 2023; 78:104939. [PMID: 37611382 DOI: 10.1016/j.msard.2023.104939] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2023] [Revised: 08/08/2023] [Accepted: 08/12/2023] [Indexed: 08/25/2023]
Abstract
INTRODUCTION Aseptic meningitis was recently reported and recognized as a novel phenotype of Myelin oligodendrocyte glycoprotein antibody-associated disease (MOG-AD). However, the frequency and clinical features of this specific subtype remain unclear. METHODS We reported sixteen MOG-AD cases with aseptic meningitis from June 2018 to June 2022. Moreover, systematic literature of 17 reported cases was conducted. RESULTS Upon reviewing the records of 91 patients diagnosed with MOG-AD in our center, we identified 16 patients (17.6%; 9 men and 7 women) with aseptic meningitis-like MOG-AD. The median age at onset was 23.5 ± 15.7 years. The common clinical presentations were fever (87.5%), headache (75.0%) and seizure (18.8%). Most patients had leukocytosis (62.5%) and a significantly elevated neutrophil-lymphocyte ratio (NLR, ≥3.0). Cerebrospinal fluid showed elevated intracranial hypertension (43.8%), elevated leukocytes (100%) and protein (56.3%). Negative brain magnetic resonance images were observed in 6 patients and only meningeal enhancement was observed in 8 patients at first. Almost all patients had a prolonged fever (over 2 weeks) and ineffectual antibiotic treatment. All patients experienced an effective response to immunotherapy. The majority had a benign course (low Expanded Disability Status Scale score and relapsing rate). Five patients (31.3%) progressed and four patients (25.0%) experienced recurrence. Aseptic meningitis-like MOG-AD of 17 cases reported in previous studies showed similar clinical features to our cases. CONCLUSION Aseptic meningitis could be an initial or isolated manifestation of MOG-AD. It is an underestimated phenotype of MOG-AD.
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Affiliation(s)
- Meifeng Gu
- Department of Neurology, The Second Xiangya Hospital, Central South University, Changsha 410000, China; Department of Special Needs Ward, The Zhuzhou Central Hospital, Central South University, Zhuzhou 412000, China
| | - Xiaoqin Mo
- Department of Neurology, The Second Xiangya Hospital, Central South University, Changsha 410000, China
| | - Ziyu Fang
- Department of Neurology, The Second Xiangya Hospital, Central South University, Changsha 410000, China
| | - Hainan Zhang
- Department of Neurology, The Second Xiangya Hospital, Central South University, Changsha 410000, China
| | - Wei Lu
- Department of Neurology, The Second Xiangya Hospital, Central South University, Changsha 410000, China
| | - Xiangmin Shen
- Department of Neurology, The Second Xiangya Hospital, Central South University, Changsha 410000, China; Department of Neurology, Guilin Hospital of The Second Xiangya Hospital, Central South University, Gui Lin 541000, China
| | - Liang Yang
- Department of Neurosurgery, The Third Xiangya Hospital, Central South University, Changsha 410000, China
| | - Wei Wang
- Department of Neurology, The Second Xiangya Hospital, Central South University, Changsha 410000, China.
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Qin N, Wu X, Wang J, Wang W, Wang X, Ma Y, Wang L. Case report: Autoimmune glial fibrillary acidic protein astrocytopathy misdiagnosed as tuberculous meningitis. Front Neurol 2023; 14:1123603. [PMID: 36970528 PMCID: PMC10034075 DOI: 10.3389/fneur.2023.1123603] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2022] [Accepted: 02/13/2023] [Indexed: 03/11/2023] Open
Abstract
IntroductionAutoimmune glial fibrillary acidic protein (GFAP) astrocytopathy is a new form of autoimmunity-mediated central nervous system disease. It is especially easy to misdiagnose when clinical symptoms and cerebrospinal fluid (CSF) indicators are similar to those observed in patients with tuberculous meningitis (TBM).MethodsWe retrospectively analyzed five cases of autoimmune GFAP astrocytopathy that were initially misdiagnosed as TBM.ResultsIn the five reported cases, all but one patient had meningoencephalitis in the clinic, and all patients exhibited increased pressure, lymphocytosis, increased protein levels, and decreased glucose levels in their CSF results and did not have typical imaging findings of autoimmune GFAP astrocytopathy. TBM was the initial diagnosis in all five patients. However, we found no direct evidence of tuberculosis infection, and anti-tuberculosis treatment had inconclusive effects. Following a GFAP antibody test, the diagnosis of autoimmune GFAP astrocytopathy was made.ConclusionWhen there is a suspected diagnosis of TBM but TB-related tests are negative, the possibility of autoimmune GFAP astrocytopathy should be considered.
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Salari M, Zaker Harofteh B, Etemadifar M. Autoimmune meningoencephalitis associated with anti‐glutamic acid decarboxylase antibody following COVID‐19 infection: A case report. Clin Case Rep 2022; 10:e6597. [PMCID: PMC9743303 DOI: 10.1002/ccr3.6597] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2022] [Revised: 09/29/2022] [Accepted: 10/19/2022] [Indexed: 12/14/2022] Open
Abstract
Anti‐glutamic acid decarboxylase (Anti‐GAD) are associated with various neurologic condition; but no meningitis has been reported with it, so far. Evidence demonstrates the associated of autoimmune meningoencephalitis with COVID‐19 infection. Here, we report a 44‐year‐old female with progressive loss of consciousness with anti‐GAD65 meningoencephalitis 1 month after COVID‐19 infection.
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Affiliation(s)
- Mehri Salari
- Department of Neurological diseaseShahid Beheshti University of Medical SciencesTehranIran
| | - Bahareh Zaker Harofteh
- Department of Neurological diseaseShahid Beheshti University of Medical SciencesTehranIran
| | - Masoud Etemadifar
- Department of Neurosurgery, Al Zahra University HospitalIsfahan University of Medical SciencesIsfahanIran
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Lin S, Long W, Wen J, Su Q, Liao J, Hu Z. Myelin oligodendrocyte glycoprotein antibody-associated aseptic meningitis without neurological parenchymal lesions: A novel phenotype. Mult Scler Relat Disord 2022; 68:104126. [PMID: 36115288 DOI: 10.1016/j.msard.2022.104126] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2022] [Revised: 07/15/2022] [Accepted: 08/16/2022] [Indexed: 12/15/2022]
Abstract
BACKGROUND Myelin oligodendrocyte glycoprotein (MOG) antibodies mediate inflammatory demyelinating diseases of the central nervous system. This study aimed to understand the clinical characteristics of MOG antibody-associated aseptic meningitis (MOGAM). METHODS Here, we report the cases of two children with MOGAM. A systematic literature review was conducted and included patients who had MOGAM only, without neurological parenchymal lesions. The clinical characteristics that may have affected the outcome were statistically analyzed. RESULTS We reviewed 12 cases of MOGAM; male: female = 9: 3. Prolonged fever lasting over 7 days (11/12) was the most frequent symptom, followed by headache (10/12), vomiting (5/12), and seizures (4/12). None of the patients had focal neurological manifestations or parenchymal lesions on imaging. Cerebrospinal fluid (CSF) leukocytosis was observed in all patients (12/12), and blood leukocytosis and elevated CSF pressure was observed in all patients who had corresponding results (9/9 and 4/4, respectively). Seizures occurrence was lower than that of MOG antibody-associated cortical encephalitis. Seven cases progressed to other MOG antibody-associated diseases (MOGADs) in the later phase of MOGAM. Patients who did not progress to other MOGADs had a shorter disease duration from onset to the initiation of intravenous methylprednisolone than those who did. All the patients achieved full recovery after steroid treatment. One patient had relapses. CONCLUSIONS MOGAM without inflammatory demyelination is a rare but distinct phenotype of MOGAD, with fewer clinical manifestations mimicking bacterial or viral meningitis/encephalomeningitis. Delayed diagnosis and treatment may induce the progression to other severe MOGADs. Early recognition of this unique autoimmune aseptic meningitis may contribute to early diagnosis, treatment, and better outcomes.
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Affiliation(s)
- Sufang Lin
- Department of Neurology, Shenzhen Children's Hospital, Shenzhen 518038, Guangdong, China.
| | - Weiwei Long
- Department of Neurology, Shenzhen Children's Hospital, Shenzhen 518038, Guangdong, China
| | - Jialun Wen
- Department of Neurology, Shenzhen Children's Hospital, Shenzhen 518038, Guangdong, China
| | - Qiru Su
- Department of Clinical Research, Shenzhen Children's Hospital, Shenzhen 518038, Guangdong, China
| | - Jianxiang Liao
- Department of Neurology, Shenzhen Children's Hospital, Shenzhen 518038, Guangdong, China
| | - Zhanqi Hu
- Department of Neurology, Shenzhen Children's Hospital, Shenzhen 518038, Guangdong, China
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Molazadeh N, Bose G, Lotan I, Levy M. Autoimmune diseases and cancers overlapping with myelin oligodendrocyte glycoprotein antibody-associated disease (MOGAD): A systematic review. Mult Scler J Exp Transl Clin 2022; 8:20552173221128170. [PMID: 36311694 PMCID: PMC9597055 DOI: 10.1177/20552173221128170] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2022] [Accepted: 09/06/2022] [Indexed: 11/24/2022] Open
Abstract
Background Myelin oligodendrocyte glycoprotein antibody-associated disease (MOGAD) has various similarities with AQP4-IgG-seropositive Neuromyelitis Optica Spectrum Disorder (AQP4-IgG + NMOSD) in terms of clinical presentations, magnetic resonance imaging (MRI) findings, and response to treatment. But unlike AQP4-IgG + NMOSD, which is known to coexist with various autoimmune diseases and cancers, an association of MOGAD with these conditions is less clear. Methods We conducted a systematic search in PubMed, Scopus, Web of Science, and Embase based on the preferred reporting items for systematic reviews and meta-analysis (PRISMA). Duplicates were removed using Mendeley 1.19.8 (USA production) and the citations were uploaded into Covidence systematic review platform for screening. Results The most common autoimmune disease overlapping with MOGAD was anti-N-Methyl-D-Aspartate receptor encephalitis (anti-NMDAR-EN), followed by autoimmune thyroid disorders, and the most common autoantibody was antinuclear antibody (ANA), followed by AQP4-IgG (double-positive MOG-IgG and AQP4-IgG). A few sporadic cases of cancers and MOG-IgG-associated paraneoplastic encephalomyelitis were found. Conclusion Unlike AQP4-IgG + NMOSD, MOGAD lacks clustering of autoimmune diseases and autoantibodies associated with systemic and organ-specific autoimmunity. Other than anti-NMDAR-EN and perhaps AQP4-IgG + NMOSD, the evidence thus far does not support the need for routine screening of overlapping autoimmunity and neoplasms in patients with MOGAD.
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Affiliation(s)
- Negar Molazadeh
- Negar Molazadeh, Neuromyelitis Optica
Research Laboratory, Division of Neuroimmunology & Neuroinfectious Disease,
Department of Neurology, Massachusetts General Hospital, Building 114, 16th St,
Room 3150, Charlestown, MA 02129, USA.
Twitter: http://twitter.com/NegarMowlazadeh
| | - Gauruv Bose
- Department of Neurology, Massachusetts General
Hospital, Boston, MA, USA
- Harvard Medical School, Boston, MA, USA
| | - Itay Lotan
- Department of Neurology, Massachusetts General
Hospital, Boston, MA, USA
- Harvard Medical School, Boston, MA, USA
| | - Michael Levy
- Department of Neurology, Massachusetts General
Hospital, Boston, MA, USA
- Harvard Medical School, Boston, MA, USA
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Coexistence of Myelin Oligodendrocyte Glycoprotein Immunoglobulin G and Neuronal or Glial Antibodies in the Central Nervous System: A Systematic Review. Brain Sci 2022; 12:brainsci12080995. [PMID: 36009058 PMCID: PMC9405704 DOI: 10.3390/brainsci12080995] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2022] [Revised: 07/23/2022] [Accepted: 07/24/2022] [Indexed: 12/04/2022] Open
Abstract
Background: Myelin oligodendrocyte glycoprotein immunoglobulin G (MOG-IgG) has been considered a diagnostic marker for patients with demyelinating disease, termed “MOG-IgG associated disorder” (MOGAD). Recently, the coexistence of MOG-IgG and other neuronal or glial antibodies has attracted extensive attention from clinicians. In this article, we systematically review the characteristics of MOG-IgG-related antibody coexistence syndrome. Methods: Two authors independently searched PubMed for relevant studies published before October 2021. We also manually searched the references of each related article. The appropriateness of the included studies was assessed by reading the titles, abstracts, and full texts if necessary. Results: Thirty-five relevant publications that met our inclusion criteria were finally included, of which fourteen were retrospective studies and twenty-one were case reports. A total of 113 patients were reported to show the coexistence of MOG-IgG and neuronal or glial antibodies. Additionally, 68.14% of patients were double positive for MOG-IgG and N-Methyl-D-Aspartate Receptor-IgG (NMDAR-IgG), followed by 23.01% of patients who were double positive for MOG-IgG and aquaporin4-IgG (AQP4-IgG). Encephalitis was the predominant phenotype when MOG-IgG coexisted with NMDAR-IgG, probably accompanied by imaging features of demyelination. Patients with dual positivity for MOG-IgG and AQP4-IgG experienced more severe disease and more frequent relapses. The coexistence of MOG-IgG and antibodies other than NMDAR-IgG and AQP4-IgG was extremely rare, and the clinical presentations were diverse and atypical. Except for patients who were double positive for MOG-IgG and AQP4-IgG, most patients with multiple antibodies had a good prognosis. Conclusions: MOG-IgG may coexist with neuronal or glial antibodies. Expanded screening for neuronal or glial antibodies should be performed in patients with atypical clinical and radiological features.
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