Ataxia Phenomenology Atlas (Part 2): Spinocerebellar Ataxias (SCA1-SCA17)
Spinocerebellar Ataxia Type 1 (SCA1)
Video 13.25 (C13c25): SCA1
Titubation, staring appearance, dysmetria, hypertonia, and pontocerebellar atrophy.
Video 13.26 (C13c26): SCA1 with Slow Saccades
Scanning speech, slowed saccades, hyperreflexia, and severe gait ataxia.
Video 13.27 (C13c27): Advanced SCA1
Severe dysarthria, muscle wasting, saccadic initiation failure, and inability to bear weight.
Spinocerebellar Ataxia Type 2 (SCA2)
Video 13.28 (C13c28): SCA2
Selective slowing of horizontal saccades with mild cerebellar ataxia.
-pending
Video 13.29 (C13c29): SCA2 with Round-the-House Saccades
Horizontal saccade slowing, spooning, and limb dysmetria.
Video 13.30 (C13c30): SCA2 with Jaw-Opening Dystonia
Cerebellar ataxia complicated by speech-induced cranial dystonia responsive to sensory trick.
Spinocerebellar Ataxia Type 3 (SCA3 / Machado-Joseph Disease)
Video 13.31 (C13c31): Mild SCA3
Minimal ocular motor abnormalities with moderate gait ataxia.
Video 13.32 (C13c32): SCA3
Mild cerebellar syndrome with severe gait impairment.
Video 13.33 (C13c33): Progressive SCA3
Progressive ataxia with worsening dysarthria, gait dysfunction, and MRI atrophy.
-Pending
Video 13.34 (C13c34): SCA3 with Parkinsonian Features
End-gaze nystagmus, ocular overshoot, and levodopa-responsive gait slowing.
Video 13.35 (C13c35): Advanced SCA3
Severe dysarthria and profound appendicular ataxia.
-Pending
Video 13.36 (C13c36): SCA3 with Spasticity
Round-the-house saccades, bradykinesia, ankle clonus, and spastic ataxic gait.
-Pending
Video 13.37 (C13c37): SCA3 with Pyramidal Features
Ocular dysmetria, hyperreflexia, and spastic wide-based gait.
-Pending
Video 13.38 (C13c38): Advanced SCA3
Profound gait ataxia requiring two-person assistance.
-Pending
Spinocerebellar Ataxia Type 6 (SCA6)
Video 13.39 (C13c39): SCA6
Predominantly pure cerebellar ataxia with cerebellar atrophy.
Spinocerebellar Ataxia Type 7 (SCA7)
Video 13.40 (C13c40): Advanced SCA7
Scanning dysarthria, horizontal saccade slowing, dysmetria, and severe gait ataxia.
Video 13.41 (C13c41): SCA7
Moderate gait ataxia with crutch dependence.
Video 13.42 (C13c42): SCA7 with Nystagmus
Upbeat and gaze-evoked nystagmus with cerebellar gait disorder.
Spinocerebellar Ataxia Type 8 (SCA8)
Video 13.43 (C13c43): SCA8
Slow repetitive movements and moderate gait ataxia despite relatively preserved targeting.
Spinocerebellar Ataxia Type 17 (SCA17)
Video 13.44 (C13c44): SCA17
Mild cerebellar ataxia with preserved eye movements.
Video 13.45 (C13c45): SCA17 with Myoclonus
Risor sardonicus, cerebellar ataxia, mini-myoclonus, and marked cerebellar atrophy.