A medical condition involving abnormal fluid-filled cavities or channels within the spinal cord or rectum.
From Greek ἄρχο- (árkhō-, 'beginning' or 'principal') plus syrinx (from σύριγξ, sýrinx, 'pipe', 'tube', or 'cavity'). The term combines references to hollow structures.
A syrinx (the same root as 'syringe') originally meant any tube or pipe in the body—archosyrinx was a doctor's fancy way of describing holes or hollow areas where they probably shouldn't be, especially in sensitive places.
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