Teaching video NeuroImages: shake Mom's hand to get the diagnosis.

Teaching video neuroimages: callosal apraxia: a straightforward model of ideomotor apraxia.

A 57-year-old right-handed man complained of difficulty using his hands post-coronary artery bypass graft (figure). Neurologic examination revealed signs of callosal disconnection without hemiparesis. When asked to perform limb gestures like "brush your teeth" or "wave goodbye," the right hand performed flawlessly whereas the left hand was severely apraxic (video on the Neurology Web site at ww...

Teaching Video NeuroImages: focal cortical myoclonus in progressive multifocal leukoencephalopathy.

A 52-year-old man with recently diagnosed HIV infection (CD4 count 105/mL; normal range 700– 1,200/mL) presented with a 5-week history of irregular shaking of his left hand triggered by lifting his arm accompanied by “feeling of stiffness and clumsiness.” On clinical examination, focal myoclonus with positive and negative components affecting the left upper limb with distal predominance was det...

Teaching NeuroImages: differential diagnosis of scapular winging.

Teaching Video NeuroImages: sodium channel myotonia can present with stridor.

An 11-month-old girl presented with episodic severe stridor from birth, often resulting in cyanosis. Her parents had noted recurrent unilateral ptosis. Later she developed spasms of her hands during exercise. Psychomotor development was normal. Neurologic examination showed generalized hypertonia. Cerebral MRI excluded a Chiari malformation. Laryngoscopy under general anesthesia showed no abnor...

Teaching Video NeuroImages: Re-emergent jaw tremor in Parkinson disease.

A 77-year-old woman who was diagnosed with Parkinson disease at 51 years of age presented with a 4-year history of intermittent jaw tremor. This was present at rest and declined in amplitude during voluntary movements. Tremor reappeared after the patient bit a tongue depressor continuously for 10 seconds (video on the Neurology® Web site at Neurology.org). “Re-emergent tremor” is a postural han...