anencephalia
Definition
Noun: A severe congenital defect in brain development characterized by the absence of a major portion of the brain, skull, and scalp. The condition results in the cerebral hemispheres being either extremely small or completely missing.
Usage
The term is a medical noun used specifically in clinical and pathological contexts to describe a fatal neural tube defect present at birth. It is typically used in formal writing, diagnoses, and scientific discussions.
Examples
- The prenatal ultrasound revealed signs of anencephalia in the fetus.
- Anencephalia is a condition incompatible with prolonged life outside the womb.
- The study focused on the genetic factors associated with anencephalia.
Advanced Usage
- Etiological Context: Often discussed in relation to folic acid deficiency during pregnancy, as this is a known preventable risk factor for neural tube defects like anencephalia.
- Pathological Description: Used in medical reports to describe the physical findings, e.g., "The postmortem examination confirmed the diagnosis of anencephalia."
Variants and Related Words
- Anencephaly (n.): This is the more commonly used variant term, identical in meaning to "anencephalia."
- Anencephalic (adj.): The adjective form, used to describe an affected individual or the condition itself (e.g., an anencephalic infant).
Synonyms
- Merencephaly (n.): A less common technical synonym.
Notes on Meaning
This term refers exclusively to the specific, severe congenital malformation described. It is not used metaphorically or in non-medical contexts. The primary consequence of anencephalia is the lack of consciousness and the inability to survive.
Noun
-
a defect in brain development resulting in small or missing brain hemispheres
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