Aivoatrofia

Aivoatrofia refers to a decrease in brain volume due to loss of neurons, synapses, and supporting cells. It results in thinning of brain tissue, widening of the grooves (sulci), and enlargement of the brain’s fluid-filled spaces (ventricles). Brain atrophy can be global, affecting many regions, or focal, impacting specific areas. It is typically identified on neuroimaging, especially MRI, and sometimes on CT.

Causes are diverse. While some degree of brain volume loss occurs with aging, clinically significant atrophy usually reflects pathology. Common etiologies include neurodegenerative diseases (such as Alzheimer’s disease, frontotemporal dementia, and Parkinson’s disease with dementia), cerebrovascular disease, chronic alcohol use, malnutrition or vitamin deficiencies (notably B12), thyroid or other metabolic disorders, inflammatory or infectious processes, traumatic brain injury, and hydrocephalus. In some cases atrophy develops gradually as part of a multi-factorial process.

Clinical presentation varies by affected regions and underlying cause. Patients often experience cognitive symptoms such as memory impairment, slowed thinking, and reduced executive function; behavioral or personality changes may occur with frontotemporal involvement. Motor symptoms may accompany certain diseases. The progression rate is highly disease-dependent.

Diagnosis relies on imaging and clinical evaluation. MRI is the preferred modality and can reveal patterns of atrophy that suggest specific etiologies. CT may be used when MRI is not available. A workup usually includes laboratory tests to identify reversible causes, neuropsychological testing, and, in selected cases, disease-specific biomarkers.

Management focuses on underlying causes and supportive care. This includes treating metabolic or nutritional deficiencies, managing vascular risk factors, abstaining from alcohol when appropriate, cognitive rehabilitation, physical activity, and social support. Prognosis varies with the cause and often is progressive in degenerative conditions. Aivoatrofia is a radiologic and clinical sign rather than a disease itself.