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Review Article
New Perspective on Parkinsonism in Frontotemporal Lobar Degeneration
Hee Kyung Parka, Sun J. Chungb
Journal of Movement Disorders 2013;6(1):1-8.
Published online: April 30, 2013

aDepartment of Neurology, Inje University Ilsan Paik Hospital, Goyang, Korea

bDepartment of Neurology, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea

Corresponding author: Sun J. Chung, MD, PhD Department of Neurology, Asan Medical Center, University of Ulsan College of Medicine, 88 Olympic-ro 43-gil, Songpa-gu, Seoul 138-736, Korea, Tel +82-2-3010-3440, Fax +82-2-474-4691, E-mail
The authors have no financial conflicts of interest.
• Received: February 18, 2013   • Accepted: March 1, 2013

Copyright © 2013 The Korean Movement Disorder Society

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License ( which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

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  • Frontotemporal dementia (FTD) is the second most common type of presenile dementia. Three clinical prototypes have been defined; behavioral variant FTD, semantic dementia, and progressive nonfluent aphasia. Progressive supranuclear palsy, corticobasal degeneration, and motor neuron disease may possess clinical and pathological characteristics that overlap with FTD, and it is possible that they may all belong to the same clinicopathological spectrum. Frontotemporal lobar degeneration (FTLD) is a clinicopathological syndrome that encompasses a heterogenous group of neurodegenerative disorders. Owing to the advancement in the field of molecular genetics, diagnostic imaging, and pathology, FTLD has been the focus of great interest. Nevertheless, parkinsonism in FTLD has received relatively less attention. Parkinsonism is found in approximately 20–30% of patients in FTLD. Furthermore, parkinsonism can be seen in all FTLD subtypes, and some patients with familial and sporadic FTLD can present with prominent parkinsonism. Therefore, there is a need to understand parkinsonism in FTLD in order to obtain a better understanding of the disease. With regard to the clinical characteristics, the akinetic rigid type of parkinsonism has predominantly been described. Parkinsonism is frequently observed in familial FTD, more specifically, in FTD with parkinsonism linked to chromosome 17q (FTDP-17). The genes associated with parkinsonism are microtubule associated protein tau (MAPT), progranulin (GRN or PGRN), and chromosome 9 open reading frame 72 (C9ORF72) repeat expansion. The neural substrate of parkinsonism remains to be unveiled. Dopamine transporter (DAT) imaging revealed decreased uptake of DAT, and imaging findings indicated atrophic changes of the basal ganglia. Parkinsonism can be an important feature in FTLD and, therefore, increased attention is needed on the subject.
Frontotemporal lobar degeneration (FTLD) encompasses a variety of clinical, genetic, and pathological entities. In 1892, when Arnold Pick first described a patient with presenile psychosis later to be known as Pick’s disease,1 he could not have expected that this disease entity would comprise such a wide spectrum of diseases. In 1994, the Lund and Manchester groups proposed the clinical and neuropathological criteria for frontotemporal dementia (FTD).2 This was followed by the consensus criteria on FTLD proposed by Neary et al.3 in 1998 which consisted of three different clinical syndromes: behavioral variant of frontotemporal dementia (bvFTD), progressive nonfluent aphasia (PNFA), and semantic dementia (SD).
Over the past two decades, remarkable progress in genetic, pathological, and neuroimaging studies has been made, resulting in a transformation in our concept on FTLD. Further research has given birth to three other syndromes: progressive supranuclear palsy (PSP), corticobasal degeneration (CBD), and motor neuron disease (MND), all of which have been noted to share the clinical and neuropathological findings of FTD.4,5 FTD with parkinsonism linked to chromosome 17 (FTDP-17) is the most common form of familial FTDP and its causative genes are microtubule associated protein tau (MAPT) and progranulin (GRN or PGRN).6 Parkinsonism in these familial forms of FTD is relatively well documented, but questions still linger regarding parkinsonism in other types of FTLD. While a few review articles explaining the general concept of FTLD have been published,711 very few articles have focused on parkinsonism in FTLD.12,13 Understanding parkinsonism in FTLD will without doubt help to broaden our view on FTLD. Touching on the clinical, pathological, and neuroimaging aspects of parkinsonism encountered in FTLD, this article aims to bring together the pieces of the jigsaw puzzle that constitute this complex disease.
Since Neary et al.3 proposed the clinical diagnostic criteria of three clinical syndromes in FTLD many researchers have used those criteria in order to clarify the syndromes.14 This classification system of FTD consists of behavioral and language variants of FTD. The language variants of FTD include PNFA and SD. Continuous research in the field of genetics and pathology related to FTD has disclosed that other clinical entities such as MND or PSP or CBD may be the presenting symptom of FTD. While the afore-mentioned categorization may suffice from the standpoint of cognitive neuroscience, a movement specialist may demand more understanding of motor aspect. In this regard, we would like to add the motor variant of FTD. PSP or CBD may share common clinical features and pathological findings with FTD.5 On the basis of the criteria proposed by Neary et al.,3 physical signs in FTD include parkinsonism, comprising akinesia, rigidity, and tremor. Additionally, patients with MND may develop FTD during the course of their diseases, while patients with FTD may present with symptoms of MND.15,16 FTD and MND may share the pathological features including the presence of TAR DNA-binding protein (TDP-43)-immunoreactive inclusions.17 An updated classification that includes the motor variant of FTD, which is further divided into parkinsonism-predominant and MND-predominant groups, may offer further insight into the clinical presentations of FTD (Fig. 1).
There have been few studies focusing on the prevalence of parkinsonism in sporadic FTD (Table 1).18 The researchers paid little attention to parkinsonism in FTLD and, therefore the exact prevalence and incidence of parkinsonism in FTLD has not been revealed. In a study that was published in 2004, thirty percent (n=18) of patients with pathologically proven FTLD showed extrapyramidal signs, in particular, rigidity or akinesia.4 Five patients with bvFTD, one patient with PNFA, three patients with FTD-MND, and nine patients with CBD initially presented with parkinsonism. In this report, none of the patients with SD demonstrated parkinsonism as the presenting symptom.4
Piguet et al.14 showed that less than 10% of patients with bvFTD are likely to demonstrate parkinsonism at the beginning. Even after disease progression, less than 20% of these patients eventually show parkinsonism. The results which was reported by Rascovsky et al.19 was similar. In one big cohort consisting of 364 patients with FTD, sixteen percent (n=57) displayed parkinsonism.20 In this report, from the clinical standpoint, early parkinsonism was seen in 18% (n=45) of bvFTD patients, 11% (n=6) of SD patients, and 14% (n= 5) of PNFA patients, while it was shown in only 4% (n=1) of FTD-MND patients.20 Meanwhile, genetically, parkinsonism was reported in seven patients with MAPT mutations, five patients with PGRN mutations, and five patients with an autosomal dominant form of an unknown genetic defect.20 However, this study did not show a difference in the frequency of parkinsonism of the four clinical subtypes including bvFTD, SD, PNFA, and FTD-MND between sporadic FTD and familial FTD. In a study of 56 FTD-MND patients parkinsonism was seen in one patient with behavioral-dominant FTD-MND and six patients with language-dominant FTD-MND.21 In this case series, they found that psychosis was more common in behavioral-dominant FTD-MND while parkinsonism and limb apraxia were more common in language-dominant FTDMND.21 Padovani et al.18 focused on extrapyramidal symptoms in 75 patients with bvFTD, among whom 22.7% (n=17) showed early parkinsonism. Another study evaluating parkinsonism in FTD revealed that 22% (70/319) of patients demonstrated parkinsonism. The authors divided FTD patients with parkinsonism into two groups: those who initially presented with the movement disorder (15 CBDs and 7 PSPs) and those who initially presented with a cognitive disorder followed by the development of parkinsonism (n=48).13 Regarding the presenting symptoms, Padovani et al.18 reported that parkinsonism occurred as a presenting symptom in 22.7% of their patients, while Kertesz et al.13 observed that parkinsonism as a presenting symptom in only 6% (n=22) of their patients.
As far as we know, there has been no study has reporting the survival analysis between FTD patients with and without parkinsonism. There is still need for a large, prospective, multi-center cohort study focusing on the prevalence of parkinsonism in FTD. In addition, there has been a lack of consistency due to various methodological issues, deriving from different regions of interest between movement specialists and researchers specializing in cognitive neurology, ambiguity in the definition of parkinsonism, and diversity in patient characteristics including disease duration and age.
Ever since the first report on Pick’s disease,1 there have been some case studies describing the extrapyramidal symptoms in Pick’s disease.22,23 One of these reports described a patient with a masked face, clumsiness of fingers, and cogwheel rigidity revealing extensive involvement of the caudate nucleus, the substantia nigra, the pallidum, and the subthalamic nucleus.23 The Lund and Manchester groups described parkinsonisms as late-occurring akinesia, rigidity, and tremor in 1994.2 Four years later, Neary et al.3 stated that parkinsonian signs (akinesia, rigidity, tremor) typically emerge only during late disease. Representative clinical subtypes in FTD with parkinsonism consist of PSP, CBD, and FTDP-17. Clinical and pathologic manifestations in CBD, PSP, and FTD are diverse.
Progressive supranuclear palsy may have different pathologic findings from the clinical phenotypes.24 The phenotypes of PSP may be heterogeneous.24 The classic phenotype, Richardson’s syndrome has distinctive clinical features differentiating it from Parkinson’s disease (PD) or other PSP sub-types. Vertical supranuclear gaze palsy and surprised facial appearance are characteristic features in PSP. The axial symptoms are predominant and, therefore, a lurching gait and unexpected falls can be seen. Symmetry, axial rigidity, minimal or absent tremor, and poor response to levodopa are distinguishing features of parkinsonism in PSP. Cognitive decline was observed as an early feature in 29% of patients with pathologically proven PSP and as a late feature in 74%.25 This finding is not surprising given that PSP is a clinical subtype of FTLD. Patients with pathological findings of PSP may have clinical variants of PSP such as PSP-parkinsonism (PSP-P), PSP-pure akinesia with gait freezing (PSP-PAGF), PSP-corticobasal syndrome (PSP-CBS), and PSP-progressive non-fluent aphasia (PSP-PNFA).24
Corticobasal degeneration differs from PD or PSP in terms of clinical manifestations. The clinical diagnostic criteria includes a strong degree of asymmetry with rigidity, bradykinesia, atypical tremor (postural and action), alien limb phenomenon, dystonia, myoclonus, and cortical signs (myoclonus, apraxia).26 However, there have been a lot of discrepant results between clinical and pathological diagnoses.2729 Josephs et al.5 reported that among cases that were clinically diagnosed as CBD half were pathologically proven to be CBD, while the remaining half were pathologically proven to be PSP. By contrast, 90% of cases that were clinically diagnosed to be PSP were pathologically proven to be PSP.5 In a recent study comprising 21 patients clinically diagnosed with CBS, only five patients were pathologically diagnosed to have CBD.28 The other pathological diagnoses were PSP, Alzheimer’s disease (AD), PD, and FTD. Inversely, 42% of CBD patients had been diagnosed with PSP. The overall sensitivity in predicting CBD pathology was 47%.28 In this study, the authors classified CBD into CBD-CBS and CBD-Richardson’s syndrome according to the clinical features.28
FTD with parkinsonism linked to chromosome 17 with MAPT mutation develops at an average age of 49 years and presents with behavioral change, dementia, and parkinsonism.6,12,30 It is not possible to correlate the clinical manifestations with the genetic subtypes. However, it has been previously shown that the dementia-dominant group correlated with the H1/H2 genotype, while the parkinsonism-dominant group correlated with the H1/H1 genotype.31,32 The P301L and exon 10+6 mutation carriers often present with behavioral or personality change.33 The N279K mutation carriers present with parkinsonism, which consists of rigidity, bradykinesia, falls, vertical gaze palsy, and poor response to levodopa.34 FTDP-17 with PGRN mutation develops at a mean age of 59 years and presents with various symptoms. Behavioral or personality changes and language impairment may be seen as the initial manifestation.6,30 As the disease progresses, markedly asymmetric parkinsonism such as bradykinesia or rigidity, which is similar to that observed in CBD develops.35,36 In 2011, an important mutation, an expansion of a non-coding GGGGCC hexanucleotide repeat in the C9ORF72 gene, was identified in familial FTD and ALS.37,38 Twelve of 30 patients with the C9ORF72 mutation showed parkinsonism during the disease course, and in addition, one patient presented with parkinsonism.39 In this report, parkinsonism in eight of twelve patients was predominantly akinetic rigidity, while remaining four patients demonstrated resting tremor.39
Initial manifestations of bvFTD are apathy, disinhibition, repetitive or stereotypic behavior, lack of mental flexibility, changes in eating behavior, decline in personal hygiene, and loss of sympathy.3,40 Physical signs include primitive reflexes in 40% of patients and parkinsonism in less than 10%.14 Parkinsonism in patients with PNFA may present with PSP-PNFA or CBS-PNFA and is typically akinetic-rigid type of parkinsonism.5,41 One study reported that the nonfluent/agrammatic variant of primary progressive aphasia (PPA) had significantly more parkinsonian motor features than the logopenic PPA variant.42 However, when their parkinsonian motor features were analyzed, there was no difference in gait/posture and tremor subscales between the two variants.42 SD with parkinsonism is not yet fully understood. One study reported that six 56 SD patients showed parkinsonism, but the details of their clinical features were not described.20 In the case of FTD-MND, about 12% of the patients demonstrated parkinsonism in one report, but no details were presented.21
Family history is found in approximately 45% of patients with FTD43 and autosomal dominant inheritance is found in 10%.44 Familial FTLD is more common in bvFTD, and is less common in SD and FTD-MND.44 Familial forms of FTD associated with parkinsonism are caused by two common mutations (MAPT and PGRN) and one less common genetic mutation (CHMP2B). As mentioned earlier, carriers of the C9ORF72 gene mutaion may be associated with parkinsonism.39 Severeal disorders associated with FTDP include familial PSP, hereditary diffuse leukoencephalopathy with axoal spheroids (HDLS), and neurodegenerative overlap syndrome.45
Familial FTDP associated with chromosome 17 is caused by MAPT mutations and PGRN mutations. Fourty-four pathological mutations ( and two extended haplotypes, H1 and H2, have been identified in the MAPT gene. H1 haplotype is hyperexpressed in CBD and PSP, which indicates its susceptibility to 4R tauopathy.46 An association has been found between the H1/H1 genotype and the parkinsonism-plus-predominant phenotype in carriers of MAPT mutations.31,32 The discovery of PGRN mutations has been made in 2006.47 Since then, 67 pathological mutations ( have been found. PGRN mutation carriers may demonstrate various clinical manifestations, although the exact correlation between the genotype and phenotype cannot be made.48 One fourth of the patients with PGRN mutation may show manifestations similar to patients with PNFA; however, progressive aphasia in these patients usually does not include apraxia of speech.49
The FUS gene mutation was first reported in familial and sporadic ALS in 2009.5052 However, it has rarely been observed in patients with bvFTD53 or FTLD-ALS.5456 One patient with FUS mutation developed ALS with gait and speech difficulty, while the patient’s brother was diagnosed with parkinsonism and dementia.54 Reports on parkinsonism in carriers of the FUS mutation have been limited. Expanded GGGGCC repeat in C9ORF72 is an important cause of FTD and ALS.37,38 The identification of C9ORF72 repeat expansions adds FTD-MND to the category of noncoding repeat expansion disorders, for example, spinocerebellar ataxia (SCA8, SCA31, SCA36),5759 myotonic dystrophies (DM1 and DM2),60,61 and fragile-X associated tremor/ataxia syndrome (FXTAS).62 Given that 48% of patients with the C9ORF72 mutation showed parkinsonism,39 further research may identify this gene as an important cause of FTD with parkinsonism.
Pathological findings in FTLD can be subclassified according to the accumulated protein: FTLD with tau inclusions (FTLD-tau), FTLD with tau-negative and TDP-43-positive inclusions (FTLD-TDP), and FTLD with tau/TDP-43 negative and FUS-positive inclusions (FTLD-FUS).63 Based on five large clinicopathologic studies,4,5,6466 the most common pathology in FTLD-tau was CBD (35%), followed by PSP (31%), Pick’s disease (30%), and agyrophilic grain disease (4%).67 FTLD-TDP consists of four subtype; FTLD-TDP type 1, 2, 3, 4.63 FTLD-tau pathology are mostly associated with clinical syndromes, bvFTD, PNFA, PSP, CBD, and FTLD-17 (MA-PT), while FTLD-TDP pathology are related with bvFTD, SD, CBS, FTDP-17 (PGRN), and FTD-MND.67 FTLD-tau pathology is rarely found in patients with SD while FTLDTDP pathology is uncommon in patients with PNFA.67 It seems that prominent parkinsonism is most likely associated with FTLD-tau pathology.64,67 FTLD-FUS pathology may be found in patients with bvFTD.68 The burden of FUS pathology was found to be moderate not only in the frontal and temporal neocortex but also in the striatum.68 Patients with the C9ORF72 mutation did not show correlation between the degree of extrapyramidal dysfunction and any measure of pathology in the striatum or substantia nigra.39 One patient with the C9OR72 expansion who was diagnosed with both PD and ALS had neuropathological features of both PD and ALS including cell loss from the substantia nigra and 6/6 Braak grade α-synuclein pathology.69
The brain magnetic resonance imaging (MRI) performed in patients with FTD typically reveals prominent asymmetric atrophy of the frontal and temporal lobes.70 Fluorodeoxyglucose positron emission tomography (FDG PET) can improve diagnostic accuracy by revealing hypometabolism in those areas.71 Various findings have been reported in the clinical subtypes of FTD (Fig. 2). Progressive degeneration in bvFTD can be found in anterior cingulate cortex (ACC), frontal insular (FI), rostromedial prefrontal cortex (PFC), frontal pole (FP), and ventral striatum.70,72 Salience network connectivity in bvFTD patients was dramatically attenuated in the frontoinsular area and temporal pole.73 Furthermore, bvFTD patients demonstrated striking disruption of salience network in the brainstem, limbic, and subcortical structures including substantia nigra, ventral tegmental area, nucleus accumbens, ventral striatopallidum, and thalamus.73 SD patients demonstrate remarkably asymmetric atrophic changes in ventromedial PFC, ACC, FI, and ventral striatum.74,75 With increasing disease severity, atrophic changes on the contralateral side become noticeable.75 The involvement in the frontal operculum, supplementary motor area, and dorsal insula are observed in patients with PNFA.76,77
Patients with bvFTD and FUS pathology demonstrate a distinct pattern of atrophy, with severe caudate atrophy, compared to the patients with FTLD-tau or FTLD-TDP pathology.78 When it comes to the comparison between patients with PGRN mutations and MAPT mutations, patients with PGRN mutations demonstrate more asymmetric atrophy in the frontal, temporal, and inferior parietal lobes, while patients with MAPT mutations show relatively symmetric atrophic changes in the anteromedial temporal area and orbitofrontal cortex.79,80 Although previous imaging study reported the involvement of substantia nigra,73 there has been no study focusing the correlation between parkinsonism and structural lesion in FTD.
Amyloid imaging studies can differentiate FTD from AD and dementia with Lewy bodies (DLB).81,82 In a study by Rowe et al.81 comprising 6 patients with FTD, no retention of Pittsburgh compound B (PIB) was seen. Furthermore, Engler et al.82 reported that eight of ten patients with FTD showed little retention of PIB. Therefore, amyloid PET in FTD patients with parkinsonism may potentially help differentiate FTD from DLB or vice versa (Fig. 3). However, we should consider that amyloid PET findings in DLB may be variable. Dopamine transporter imaging studies in the past revealed decreased uptake in bilateral putamina, and the correlation between the uptake ratio and parkinsonian motor status has been shown.83,84
Parkinsonism in FTLD may be an important clinical characteristic not only as a presenting feature of the PSP and CBD, but also as an accompanying feature in other subtypes of FTLD. Thus far, we do not know the exact anatomic substrate nor do we understand the pathomechanism of parkinsonism in FTLD. In the future, further researches focusing on parkinsonism in FTLD should be carried out in order to obtain a holistic understanding of FTLD.
This study was supported by a grant of the Korea Health 21 R&D Project, Ministry of Health, Welfare, and Family Affairs, Republic of Korea (A102065).
Figure 1.
Classification of frontotemporal lobar degeneration based on the clinical manifestations. FTLD: frontotemporal lobar denetation, bvFTD: behavioral variant frontotemporal dementia, PNFA: progressive nonfluent aphasia, SD: semantic dementia, PSP: progressive supranuclear palsy, CBD: corticobasal degeneration, FTDP-17: frontotemporal dementia with parkinsonism linked to chromosome 17, FTD-MND: frontotemporal dementia-motor neuron disease.
Figure 2.
Brain MRI in frontotemporal dementia patients. A: A patient with behavioral variant frontotemporal dementia who presented with parkinsonism showed frontal and temporal atrophy. B: The presence of symmetric atrophy in bilateral temporal lobes was seen in a semantic dementia case. C: A patient with progressive nonfluent aphasia demonstrated the focal atrophy of the left perisylvian area.
Figure 3.
Positron emission tomography (PET) images in a frontotemporal dementia (FTD) patient. This FTD patient who presented with parkinsonism demonstrated frontotemporal hypometabolism in fluorodeoxyglucose positron emission tomography (FDG PET) (A). [11C] Pittsburgh compound-B (PIB) PET showed little PIB retention.
Table 1.
Clinical characteristics of patients with frontotemporal dementia who demonstrated parkinsonism
Frequency Parkinsonism Clinical classification Pathology
Hodges et al.4 30% (n=18/61) Rigidity or akinesia bvFTD (5), SD (0), PNFA (1), FTD-MND (3), CBD(9) Yes
Piguet et al.14 <20% Lack of detailed description bvFTD Yes: 18/45
Rascovsky et al.19 <20% Akinesia, rigidity, tremor bvFTD Yes: 176/176
Seelaar et al.20 16% (n=57/364) Two of four clinical signs (rigidity, tremor, bradykinesia, and postural instability) bvFTD (45), SD (6), PNFA (5), FTD-MND (1) Yes: 35/364
Coon et al.21 12.5% (n=7/56) Lack of detailed description FTD-MND (7) No
Padovani et al.18 22.7% (n=17/75) Based on UPDRS rating bvFTD (17) No
Kertesz et al.13 22% (n=70/319) Lack of detailed description CBD (15), PSP (7), aphasic, behavioral or both (48) No

bvFTD: behavioral variant frontotemporal dementia, SD: semantic dementia, PNFA: progressive nonfluent aphasia, FTD-MND: frontotemporal dementia with motor neuron disease, CBD: corticobasal degeneration, PSP: progressive supranuclear palsy, UPDRS: Unified Parkinson Disease Rating Scale

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