paraneoplastic neurological syndromes - academia.cat · paraneoplastic neurological syndromes...
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Paraneoplastic Neurological Syndromes
Neurological syndromes of unknown cause that often
associate with cancer
Immune-mediated?
Onconeural antibodies
•Hu (ANNA1)
•CV2 (CRMP5)
•Amphiphysin
•Yo (PCA1)
•Ri (ANNA2)
•Ma2
• Tr
Lung
Breast, ovary
testis
Hodgkin
Classical syndromes• Encephalomyelitis• Limbic encephalitis• Subacute cerebellar degeneration• Opsoclonus-myoclonus• Subacute sensory neuronopathy• Gastrointestinal pseudoobstruction• Lambert-Eaton myasthenic syndrome• Dermatomyositis
A 61 year-old, non smoker, woman presented with a 2 week history of vertigo, diplopia, and gait instability.
Unable to walk or to stand alone in the last 48 hours
Detection of onconeural (Hu, Yo, Ri, Ta, Tr, CV2, amphiphysin) antibodies: negative
CSF: Normal;
Brain MR: Normal
Breast Cancer
A 75 year-old man presented with a 6-month history of weight loss (10 Kg) and abnormal movements
No previous medical problems
- May ’05: Admitted to Hospital Clinic
Normal general examination
Cognitive evaluation: Normal
Neuroexam: Normal except video
Blood analysis: Normal
Cranial MR: Normal
Thorax CT scan:
enlarged mediastinal lymph node
Node biopsy: SCLC
Diagnosis: CV2-associated chorea
A 50 year-old man presented with a 13-month history of pruritus in left leg and trunk and progressive muscle rigidity and spasms in the same distribution
Previous medical problems: Type 2 DM
- April ’05:Normal general examination
Neuroexam: Rigidity in both legs L>R (video) and lower trunk.
Blood and CSF analysis, cranial and spinal MR : Normal
Anti-GAD antibodies: negative
EMG:Continuous motor unit discharges simultaneously from opposite muscles
Mediastinoscopy and biopsy showed normal lymph node
Patient made an important improvement of rigidity with oral steroids and IVIG
September ’05: severe pruritus involving left leg and trunk. More rigidity in left leg. Development of myoclonus (video) and rigidity in right arm.
A new thorax CT: enlarged lymph nodes in mediastinum
Biopsy: SCLC
Diagnosis:
Paraneoplastic SMS and spinal myoclonus
Amphiphysin antibody: positive
A 76 year-old man presented with a 1 weekhistory of progressive confusion and severe memory deficit
-August’04: Admitted to Hospital Clinic
Normal general examination
Neuroexam: Disoriented,severe short-term memory deficit with confabulations.
Detection of onconeural (Hu, Yo, Ri, Ta, CV2, amphiphysin) and VGKC antibodies: negative
CSF: Normal; Brain MR: Normal
General autopsy: SCLC CNS: neuronal loss in hippocampus with inflammatory infiltrates. Study of herpes virus: negative
Diagnosis:
Seronegative limbic encephalitis
Anti-GABAR-B1 LCR Co-localización
Antibodies against neuronal surface antigens
• Probably pathogenic
•Markers of the neurological syndrome
•Frequency of cancer variable
• Good response to immunotherapy
Antibodies against neuronal surface antigens
Ab Syndrome % paraneo DetectionVGCC LEMS/PCD 50 RIAmGluR1 PCD 0? CBAVGKC LE 5 RIANMDAR Encephalitis 30 CBAAMPAR LE 70 CBAGABAR LE 47 CBA
LEMS: Lambert-Eaton; LE: limbic encephalitis; PCD: Paraneoplastic cerebellar degeneration. RIA: radioimmunoassay; CBA: “cell based assay”
A 68 year-old man presented with a 2-month history of progressive gait instability and mild memory deficit
No previous medical problems
- May ’05: Admitted to Hospital Clinic
Normal general examination
Cognitive evaluation: mild short-term memory deficit
Neuroexam: Normal except gait (video)
Blood analysis: Normal
Cranial MR: Questionable LE
Highest-level gait disorders
• Cautious gait• Subcortical disequilibrium• Frontal disequilibrium• Isolated gait ignition failure• Frontal gait disorder
Nutt et al. Neurology 1993;43:268-79
PET PET-CT
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