avulsion

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avulsion

[ə′vəl·shən]
(hydrology)
A sudden change in the course of a stream by which a portion of land is cut off, as where a stream cuts across and forms an oxbow.
(medicine)
Tearing one part away from the other, either by trauma or surgery.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
Because optic nerve avulsion is usually accompanied by vitreous hemorrhage, diagnosis by ophthalmoscopic examination is not always possible in the acute phase.
[5] Possible ocular and peri-ocular injuries include corneal lacerations, scleral lacerations, globe rupture, optic nerve avulsion, extra-ocular muscle damage, and damage to the lacrimal apparatus and lacrimal gland.
of patients Percentage(%) Lid edemarecchymosis 26 40.0 Subconjuctival 14 21.5 hemorrhage, chemosis Pupillary abnormalities 24 36.9 Cranial nerve palsy 15 23.1 [3.sup.rd] nerve 5 7.7 [4.sup.th] nerve 0 0 [6.sup.th] nerve 4 6.2 [7.sup.th] nerve 6 9.2 Abnormal eye movement 2 3.0 Conjugate deviation 2 3.0 Orbital fractures 10 15.3 Visual abnormality 15 23.1 Retinal hemorrhage 3 4.6 papilloedema 14 21.5 Optic atrophy 7 10.8 Optic nerve avulsion 0 0 Perforation, vitreous 6 9.2 hemorrhage Majority of patients with ophthalmic findings had some sort of craniocerebral injury detected on CT scan.