Spinal retroflexion in craniorhachischisis: its classification and limitations

Area of Science:

• Developmental Biology
• Teratology
• Human Anatomy

Background:

• Craniorachischisis is a severe congenital anomaly.
• Spinal retroflexion is a feature observed in certain neural tube defects.
• Accurate classification of spinal retroflexion is crucial for understanding associated anomalies.

Purpose of the Study:

• To classify spinal retroflexion in human fetuses with craniorachischisis.
• To differentiate spinal retroflexion in craniorachischisis from iniencephaly.
• To propose precise terminology for describing spinal retroflexion.

Main Methods:

• Examination of five stillborn human fetuses with craniorachischisis.
• Analysis of craniofacial features, mentothoracic junction, hairline extension, spinal radiography, and diaphragmatic defects.
• Comparative assessment with features of iniencephaly.

Main Results:

• Spinal retroflexion in craniorachischisis can be graded as severe, moderate, or mild.
• Distinct features differentiate the three grades, including facial direction and spinal abnormalities.
• Severe and moderate retroflexion share features with iniencephaly, while mild retroflexion is distinct.

Conclusions:

• A grading system for spinal retroflexion in craniorachischisis is proposed.
• Mild spinal retroflexion in this condition should not be confused with iniencephaly.
• Precise terminology, such as 'mild spinal retroflexion', is recommended for accurate diagnosis.