Lethal arthrogryposis multiplex congenita: a pathological study of 21 cases

Area of Science:

• Pediatric Pathology
• Neuromuscular Disorders
• Medical Genetics

Background:

• Arthrogryposis multiplex congenita (AMC) encompasses a group of non-progressive neuromuscular disorders.
• Lethal forms of AMC often present diagnostic challenges, necessitating detailed etiological investigation.
• Prenatal diagnosis and termination of affected pregnancies highlight the need for accurate recurrence risk assessment.

Purpose of the Study:

• To determine the underlying causes of lethal AMC cases.
• To evaluate the utility of histochemical and histological muscle analysis in diagnosing AMC subtypes.
• To identify factors influencing familial recurrence in lethal AMC.

Main Methods:

• Histochemical and histological examination of muscle tissue from 21 deceased AMC cases.
• Neuropathological assessment for neurogenic causes.
• Syndrome recognition techniques were employed but found limited.

Main Results:

• Myogenic origin identified in 11 cases (10 congenital muscular dystrophy, 1 nemaline rod myopathy).
• Neurogenic origin confirmed in 5 cases (intra-uterine anoxic-ischaemic damage, cerebro-ocular-facio-skeletal syndrome).
• Causation remained uncertain in 5 cases; diaphragmatic and lung hypoplasia were common, as was birth trauma.

Conclusions:

• Muscle histochemistry and neuropathology are essential for accurate diagnosis and etiological determination in lethal AMC.
• Myogenic causes were associated with higher familial recurrence rates.
• Accurate etiological diagnosis is crucial for predicting recurrence risks in lethal AMC, surpassing syndrome recognition alone.