| fistula knife | A long, thin-bladed, probe-pointed knife for slitting open a fistula. Synonym: fistula knife, syringotome. Origin: fistula + G. Tome, a cutting (05 Mar 2000) |
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| fistula test | Compression or rarefaction of the air in the external auditory canal excites nystagmus when there is an erosion of the otic capsule, so long as the labyrinth is still capable of functioning. (05 Mar 2000) |
| lacrimal fistula | An abnormal opening into a tear duct or the lacrimal sac. (05 Mar 2000) |
| lacteal fistula | A fistulous opening into one of the lactiferous ducts. Synonym: mammary fistula. (05 Mar 2000) |
| lymphatic fistula | A congenital fistula in the neck connecting with a lymphatic vessel and giving exit to lymph. (05 Mar 2000) |