The alien hand sign.

Area of Science:

• Neurology
• Neuroscience
• Clinical Case Reports

Background:

• Alien hand syndrome (AHS) is a rare neurological disorder characterized by a foreign-feeling or uncontrollable limb.
• It is often associated with specific types of brain lesions, including stroke and neurodegenerative diseases.
• Understanding the pathogenesis of AHS is crucial for diagnosis and management.

Purpose of the Study:

• To report a clinical case of alien hand syndrome in a male patient following a stroke.
• To discuss the potential pathogenesis and underlying mechanisms of alien hand syndrome.
• To contribute to the literature on rare neurological symptoms and their etiologies.

Main Methods:

• Case report presentation of a male patient with alien hand syndrome.
• Review of relevant medical literature on alien hand syndrome and stroke.
• Discussion of neuroanatomical correlates and proposed pathophysiological mechanisms.

Main Results:

• The patient presented with involuntary, purposeful movements of one hand, characteristic of alien hand syndrome.
• The stroke lesion was localized to specific brain regions implicated in AHS pathogenesis.
• Discussion highlights the complex interplay between motor control, interhemispheric communication, and body ownership.

Conclusions:

• Alien hand syndrome following stroke, though rare, highlights the intricate neural networks governing voluntary movement and body awareness.
• Further research into the neurobiological underpinnings of AHS can enhance our understanding of brain function and dysfunction.
• This case underscores the importance of recognizing and investigating unusual neurological presentations for accurate diagnosis.