UKMLA PLAB AMC USMLE Prometric MCQ

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