Craniocervical intradural neurenteric cysts.

Abstract

Neurenteric cysts are rare lesions of the central nervous system that are lined by epithelium of intestinal nature. They result from abnormal separation of germ cell layers in the 3rd week of embryonic life, leading to persistence of entodermal elements in the spinal canal. The common location is cervical and ventral to the spinal cord. The lesions have been recognized as being entodermal in origin by such markers as vertebral anomalies, gut cysts, bowel reduplication and the presence of keratin markers. Three unusual cases of childhood craniocervical intradural neurenteric cysts in patients aged 4-8 years are described. These cysts were located in the ventral aspect of the spinal canal ranging from the craniocervical junction to the C6 level and were associated with bony anomalies such as a bifid clivus, hemivertebrae and blocked vertebrae. Two patients presented with signs of cervical cord compression and 1 with recurrent meningitis. One child with an anterior cervicomedullary region mass had undergone unsuccessful transoral transpalatal exploration and subsequently required excision with a dorsolateral approach. The second patient, after two successful attempts at drainage via laminectomies, required myelotomy of the spinal cord to allow excision. Thus the patient with the lesion from C4 through C6 underwent vertebrectomy and anterior excision with a C4 through C7 strut graft fusion. There were bony and vascular anomalies which would have complicated a dorsal approach. Pathological diagnosis of neurenteric cysts was based on the findings of nonciliated mucin producing small cuboidal or columnar epithelium lining a cystic cavity. Neurenteric cysts are uncommon congenital anomalies which may become symptomatic in the pediatric population.(ABSTRACT TRUNCATED AT 250 WORDS)