Which histologic findings are characteristics of neurogenic types of arthrogryposis multiplex congenita (AMC)?

Updated: Jan 03, 2019
  • Author: Mithilesh K Lal, MD, MBBS, MRCP, FRCPCH, MRCPCH(UK); Chief Editor: Maria Descartes, MD  more...
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Answer

Muscle fiber type predominance or disproportion is the most common neurogenic abnormality in arthrogryposis (26%). These are nonspecific alterations. Dysgenesis of the motor nuclei of the spinal cord and brainstem involves the replacement of fasciculi of muscle fibers by small muscle fibers and adipose tissue. Examples include Pierre-Robin syndrome and Möbius syndrome.

Dysgenesis of the CNS is the second most common neurogenic abnormality in arthrogryposis (23%), with disorganization of neurons and a decrease in neurons of the cortex and motor nuclei of the brainstem and spinal cord. Clinical syndromes associated with this abnormality include trisomy 18, partial deletion of the long arm of chromosome 18 syndrome, and Zellweger syndrome.

Dysgenesis of the anterior horn, another common neurogenic abnormality in arthrogryposis, is the cause of Meckel-Gruber syndrome and anencephaly.

Spinal muscular atrophy (eg, Werdnig-Hoffmann disease) is another neurogenic abnormality in arthrogryposis.


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