- 1Department of Clinical Genetics, ATC, Addenbrooke's Hospital, Cambridge, UK
- 2Department of Paediatric Neurology, Addenbrooke's Hospital, Cambridge, UK
- Correspondence to Dr C Geoffrey Woods, Department of Clinical Genetics, ATC, Addenbrooke's Hospital, Cambridge CB2 0XY, UK;
- Received 15 February 2013
- Revised 30 April 2013
- Accepted 4 June 2013
- Published Online First 28 June 2013
1. Microcephaly is a clinical finding, not a ‘disease’, and is a crude but trusted assessment of intracranial brain volume.
2. Developmental processes reducing in utero neuron generation present at birth with ‘Primary microcephaly’.
3. ‘Secondary microcephaly’ develops after birth and predominantly reflects dendritic or white matter diseases.
4. Microcephalic conditions have a heterogeneous aetiology, but increasingly genomic tests are available that allow an exact diagnosis.