eMedicine Specialties > Ophthalmology > Lid

Ectropion

Author: Edsel Ing, MD, FRCSC, Assistant Professor, Department of Ophthalmology & Vision Sciences, University of Toronto: Consulting Staff, Toronto East General Hospital
Contributor Information and Disclosures

Updated: Dec 27, 2006

Introduction

Background

Ectropion is an abnormal eversion (outward turning) of the lid margin away from the globe. Without normal lid globe apposition, corneal exposure, tearing, keratinization of the palpebral conjunctiva, and visual loss may result. Ectropion usually involves the lower lid and often has a component of horizontal lid laxity. Treatment is individualized based on the appropriate identification of the etiology.

Pathophysiology

The pathophysiology depends on the type of ectropion and is discussed within this article.

Mortality/Morbidity

The primary morbidity is associated with corneal/conjunctival exposure. Tearing may also cause significant patient complaints.

Race

No racial predilection has been described.

Sex

No sexual predilection has been described.

Age

Ectropion can affect patients of any age but is most commonly seen in older adults.

Clinical

History

• Patients may have a lid deformity for months or even years before they seek medical attention.
• Patients often complain of irritated or red eyes with tearing. They may constantly wipe their eyes, thereby exacerbating lid laxity and the ectropion.
• Advanced age or long-term use of eye drops may suggest the patient has involutional ectropion. A history of facial burns, lid surgery, or lid trauma is usually easily confirmed on cursory examination. It suggests cicatricial ectropion.
• For patients with Bell palsy, the caregiver should be asked if nocturnal lagophthalmos occurs. These patients should also be examined for corneal problems.

Physical

• Gestalt examination of the visage may reveal a connective tissue disorder, prior surgical scars or burns, cancerous skin conditions, or the physiognomy for floppy eyelid syndrome. All of these findings may be important in ectropion evaluation.
• Documentation of visual acuity and examination of the cornea and the conjunctiva are part of any complete oculoplastic examination. Corneal exposure, corneal ulceration, and conjunctival keratinization may accompany ectropion.
• Because of gravity, ectropion usually involves the lower lid and is described as punctal, medial, lateral, or tarsal (complete). Laxity-related ectropion typically begins medially; with time, the central lid margin and the lateral lid may evert.
• Both the distraction test and the snap-back test are usually performed for abnormal horizontal lid laxity.
  • Anterior lid distraction of more than 6-8 mm from the globe suggests horizontal lid laxity.
  • If the lower lid is pulled inferiorly, the lid should quickly return to its previous position. If not, this may be interpreted as an abnormal snap-back test result. The patient should not be allowed to blink the eyelid back into position.
• If cicatricial ectropion is suspected, superiorly displace the lower lid margin. If the lower lid margin does not extend 2 mm above the inferior limbus, then consider cicatricial ectropion.
• The puncta should not be visible, unless the lid is everted. If this is not the case, punctal ectropion is present.
• Chronic punctal ectropion may result in punctal phimosis.
• Chronic ectropion may cause keratinization of the lid margin and the palpebral conjunctiva.
• In patients with complete tarsal ectropion, a white line in the inferior fornix is often present, indicating a disinserted capsulopalpebral fascia.
• In patients with suspected paralytic ectropion, the following should be documented:
  • Corneal integrity
  • Corneal sensation
  • Presence or absence of Bell phenomenon
  • Degree of lagophthalmos - To estimate nocturnal lagophthalmos, the patient should gently close the eyelids when in the supine position.
  • Disparity between spontaneous and voluntary lid closure
• With a lower motor neuron seventh nerve palsy (eg, Bell palsy), the ipsilateral brow and the lower facial musculature are weak. With an upper motor neuron seventh nerve palsy, brow-elevation is relatively spared due to the bilateral innervation of the upper face.
• In patients with suspected facial nerve palsy, orbicularis oris dysfunction can be tested for by asking them to show their teeth rather than smile. Compare the elevation of the angles of the lips; ptosis of the lateral lip on the affected side is often present.
• If a slow-onset or nonresolving seventh nerve palsy is seen, perform the following:
  • Palpate the parotid gland for tumor.
  • Exclude prior malar skin cancer.
  • Check the patient's hearing to exclude a cerebellopontine angle tumor.
  • Perform a slit lamp examination for uveitis, which may suggest a disease process, such as sarcoidosis or Lyme disease.
• Inferior scleral show should be distinguished from ectropion, especially in patients with prominent globes. Horizontal eyelid tightening will exacerbate the scleral show of a proptotic eye, because the shortest arc between the canthi lies inferior to the cornea.
• Patients with involutional ectropion of the lower lid may also have involutional changes of the upper eyelid. Failure to recognize this prior to horizontal tightening of the lower lid may result in the upper lid prolapsing over the lower lid margin with the lower lid lashes rubbing the palpebral conjunctiva of the upper lid (ie, a form of floppy eyelid syndrome).

Causes

• Ectropion may be congenital or acquired.
  • Congenital ectropion is rare and usually involves the lower lid. The cause often is a vertical deficiency of the anterior lamella.
  • Congenital ectropion is rarely an isolated anomaly. It may be associated with blepharophimosis syndrome, microphthalmos, buphthalmos, orbital cysts, Down syndrome, and ichthyosis (collodion baby).
  • Occasional congenital ectropion cases are on a paralytic basis.
• Acquired ectropion may be involutional, paralytic, cicatricial, or mechanical.
• Involutional ectropion is the most common form of ectropion.
• A major factor is horizontal lid laxity, usually due to age-related weakness (most patients are elderly) of the canthal ligaments and the pretarsal orbicularis. Patients with involutional ectropion have been suggested to have an age-normal or larger than normal tarsal plate, which may mechanically overcome normal or decreased orbicularis tone, in conjunction with canthal tendon laxity.
• Patients with an anophthalmic socket may have involutional ectropion due to chronic pressure of the ocular prosthesis.
• Disinsertion of the capsulopalpebral fascia may lead to severe tarsal ectropion.
• Paralytic ectropion may occur with seventh nerve palsy from diverse causes, such as Bell palsy, cerebellopontine angle tumors, herpes zoster oticus, and infiltrations or tumors of the parotid gland.
• Cicatricial ectropion occurs from scarring of the anterior lamella by conditions, such as facial burns, trauma, chronic dermatitis, or excessive skin excision (or laser) with blepharoplasty.
• Ectropion is not uncommon after orbital fracture repair with a transcutaneous approach.
• Less common causes of cicatricial ectropion include cutaneous T-cell lymphoma.
• Mechanical tumors may occur with lid tumors, such as neurofibromas that evert the lower lid.
• Acute "idiopathic" bilateral lower lid ectropion has been described. An uncommon case of bilateral upper lid ectropion from blepharospasm has also been described.

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