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Prolapse, abnormal depression, or falling down of an organ or part; applied especially to drooping of the upper eyelid, from paralysis of the third cranial nerve.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.



drooping of the upper eyelid. It may be unilateral or bilateral, total or partial, or congenital or acquired. Congenital ptosis is caused by incomplete development or absence of the muscle that lifts the upper lid. The condition is treated by surgery.

Acquired ptosis is generally unilateral; it results from such diseases as neuritis of the oculomotor nerve and encephalitis, which lead to paresis or paralysis of the oculomotor nerve that innervates the muscle lifting the upper lid. The condition is treated by eliminating the underlying disease, by physiotherapy, and occasionally by surgery.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
References in periodicals archive ?
Female patients with large-volume, severely ptotic breasts who are candidates for NSM pose a specific challenge to reconstructive surgeons.
Review of the literature revealed three studies that focused on staged reduction mastopexy and NSM for women with large, ptotic breasts [1, 13, 23].
In summary, this study presents an alternate technique for simultaneous NSM and reduction mastopexy for women with large, ptotic breasts.
Gui, "Nipple-sparing mastectomy in women with large or ptotic breasts," Journal of Plastic, Reconstructive and Aesthetic Surgery, vol.
Marocco et al., "Nipple-areola complex sparing mastectomy with periareolarpexy for breast cancer patients with moderately ptotic breasts," Journal of Plastic, Reconstructive & Aesthetic Surgery, vol.
Teal, "Subcutaneous mastectomy in small, large, or ptotic breasts with immediate submuscular placement of implants," Plastic and Reconstructive Surgery, vol.
Hyland, "Technique for subcutaneous mastectomy and immediate reconstruction in the ptotic breast," Plastic and Reconstructive Surgery, vol.
Allen, "Nipple-sparing mastectomy and immediate free-flap reconstruction in the large ptotic breast," Annals of Plastic Surgery, vol.
Pennati et al., "Skin/nipple sparing mastectomies and implant-based breast reconstruction in patients with large and ptotic breast: oncological and reconstructive results" The Breast, vol.
The ptosis crutch described by this project provides an important step in offering a standard rather than an ad-hoc solution to elevating the ptotic eyelid of MG patients.
Rossi, "Nipple-sparing mastectomy: An alternative technique for large ptotic breasts," Journal of the American College of Surgeons, vol.