Multiple extradural arachnoid cysts: report of two operated cousin cases.
METHODS
Report of 2 operated cousin cases of the multiple spinal extradural arachnoid cysts.


OBJECTIVE
To report the operative findings of cousin cases of the multiple spinal extradural arachnoid cysts and analyze a genetic etiology with the pedigree of all family members.


BACKGROUND
Spinal extradural arachnoid cyst is a relatively rare condition that occupies the intraspinal space and sometimes causes neurologic disturbances. The exact etiology is unknown since most reported cases are sporadic. Minimally invasive treatments have been recently applied to a single extradural arachnoid cyst. However, it is still unknown which minimally invasive treatments can be applied to the multiple extradural arachnoid cysts.


METHODS
We experienced 2 cousin cases of multiple spinal extradural arachnoid cysts. Operative findings were described. The pedigree of all family members was made, and a genetic etiology was discussed.


RESULTS
Minimally invasive treatment was tried in Case 1. However, it failed to remove all cysts completely. Each cyst had each stalk communicating with subarachnoid space in both cases. Pedigree showed that the mode of inheritance was likely autosomal dominant.


CONCLUSIONS
When the cysts are multiple, it is necessary to identify a dural defect in each cyst. The etiology of the multiple extradural arachnoid cysts may be hereditary.
Yabuki
Shoji
S
Department of Orthopaedic Surgery, Fukushima Medical University School of Medicine, Fukushima City, Fukushima, Japan. yabuki@fmu.ac.jp
Kikuchi
Shin-ichi
S
D000293:Adolescent; D016080:Arachnoid Cysts / Q000235:genetics / Q000473:pathology / Q000601:surgery*; D002648:Child; D004824:Epidural Space / Q000473:pathology; D005190:Family; D005260:Female; D020022:Genetic Predisposition to Disease; D006801:Humans; D007796:Laminectomy; D019028:Magnetic Resonance Imaging, Cine; D019060:Minimally Invasive Surgical Procedures; D010375:Pedigree; D012307:Risk Factors; D013346:Subarachnoid Space / Q000473:pathology; D013904:Thoracic Vertebrae / Q000473:pathology / Q000601:surgery*; D016896:Treatment Outcome