dorsal dermal sinus

Question Number 1360

the following are true of dorsal dermal sinus

a) is the result of incomplete separation of the cutaneous ectoderm from the neural ectoderm
b) is most often lumbo-sacral in location
c) it is ventral in over 5%
d) MR is the best modality to define intraspinal anatomy
e) about half of all dorsal dermal sinuses end in dermoid or epidermoid cysts

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