Cortical Basal Ganglionic Degeneration Clinical Presentation
- Author: Anna M Barrett, MD; Chief Editor: Selim R Benbadis, MD more...
History
Boeve et al proposed the following clinical diagnostic criteria for cortical basal ganglionic degeneration (CBGD):[3]
- Insidious onset and progressive course
- No identifiable alternative cause (stroke, tumor, etc)
- Cortical dysfunction including at least 1 of the following:
- Focal or asymmetric ideomotor apraxia[37] : Disorder of skilled, learned, purposeful movement; this is one of the few disorders in which limb apraxia can appear in the history (ie, patients are often aware of the apraxia).
- Alien limb ("My hand/leg has a mind of its own.")
- Cortical (parietal) sensory loss
- Visual or tactile neglect
- Constructional apraxia
- Focal or asymmetric myoclonus
- Apraxia of speech or nonfluent aphasia[35]
- Extrapyramidal dysfunction, including at least 1 of the following:
- Focal or asymmetric appendicular rigidity (unresponsive to levodopa)[37]
- Focal or asymmetric appendicular dystonia
- In some cases, associated depression and postural instability
- Unusual presentations, for example, primary progressive aphasia and progressive buccofacial apraxia
- Prominent delusions or hallucinations (not related to levodopa): These suggest that the patient does not have CBGD; they are more characteristic of diffuse Lewy body disease.
Physical
- Limb apraxia: Patients must make errors beyond using a body part as a tool (eg, using fingers as scissor blades). Errors often suggest ideomotor or limb-kinetic apraxia.
- Other mental abnormalities include the following:
- Amnesia
- Generally, no "cognitive" abnormalities (eg, right-left disorientation, naming difficulty, acalculia), but rather "frontal-executive" deficits (eg, distractibility, perseveration, loss of judgment, motor planning deficit even on the less motor-impaired side)
- Eye movements: These can be impaired, with restricted horizontal movements as well as upgaze; restricted downgaze is suggestive of progressive supranuclear palsy.
- Dystonia: This is not purely action induced.
- Myoclonus: Myoclonus must spread beyond fingers if stimulus sensitive.
- Rigidity: This must be elicited easily without reinforcement.
- No resting tremor is present.
- No autonomic disturbance is present.
- Cortical sensory loss: Loss of graphesthesia (ability to identify a letter drawn in the hand or on the finger) can be a sensitive test.
Causes
- The cause of CBGD is unknown.
- Case reports suggest that a familial predisposition may exist in some individuals with this disorder.
- Because of the clinical and pathologic relationships between CBGD, progressive supranuclear palsy, and Pick disease, interest in this disease has focused on chromosome arm 17q markers. At this point, however, no definite relationship between genetic markers in this region and CBGD has been demonstrated.
- Limb apraxia and eye movement abnormalities appear to be highly associated with left cortical structural change.
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