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James A. J. King, Kurtis I. Auguste, William Halliday, James M. Drake and Abhaya V. Kulkarni

Hydrocephalus secondary to giant retrocerebellar cysts in infancy is a challenging condition and many treatment options exist. The authors report on 3 consecutive cases involving infants under the age of 6 months treated successfully with ventriculocystostomy in combination with direct hydrocephalus treatment (endoscopic third ventriculostomy or shunt placement). They describe the operative procedure, the surgical morbidity, and outcome in each case and review the literature regarding surgical approaches to this condition.

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Editorial

Achondroplasia

Arnold H. Menezes

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James A. J. King, Shobhan Vachhrajani, James M. Drake and James T. Rutka

Object

Achondroplasia is the most common form of human short-limbed dwarfism. The pediatric neurosurgeon is frequently required to treat children with achondroplasia who have hydrocephalus, cervicomedullary compression (CMD), and spinal canal stenosis. Accordingly, the authors have reviewed the experience of neurosurgery in children with achondroplasia at The Hospital for Sick Children.

Methods

The medical records and neurosurgery database at The Hospital for Sick Children were searched to identify all children with achondroplasia who underwent at least 1 neurosurgical procedure between 1956 and the present.

Results

Twenty-nine children with achondroplasia underwent 85 surgical procedures: 52 for CSF diversion in 12 patients, 20 for CMD in 18 patients, 8 for spinal disorders in 4 patients, and 5 for miscellaneous purposes in 4 patients. The CSF shunts were placed almost exclusively before 1990 and were associated with a significant number of complications. Patients undergoing CMD did very well, with only 1 patient failing to improve clinically.

Conclusions

This review provides a historical perspective on the evolution of treatment of pediatric patients with achondroplasia. The use of CSF diversion procedures, formerly fraught with complications, is now rare following the realization of the natural history of CSF space enlargement in these patients. Cervicomedullary compression is more commonly recognized due to better imaging. Central apnea is now better detected by routine sleep studies. Spine surgery, although rare, requires evaluation of both spinal stenosis and instability. These patients are best evaluated by a multidisciplinary team.

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James A. J. King, William Halliday and James M. Drake

The authors report on a child with known neurofibromatosis Type 1 who developed high-grade diffuse leptomeningeal gliomatosis, without a known primary glioma. To the authors' knowledge, this is the first report of the coexistence of these conditions in a child.