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pathology of the eyelids

Thursday 2 December 2004

WKP

Definition : An eyelid is a thin fold of skin that covers and protects an eye. With the exception of the prepuce and the labia minora, it has the thinnest skin of the whole body. The levator palpebrae superioris muscle retracts the eyelid to "open" the eye. This can be either voluntarily or involuntarily.

The human eyelid features a row of eyelashes which serve to heighten the protection of the eye from dust and foreign debris. "Palpebral" (and "blepharo") means relating to the eyelids.

Pathology

- eyelid anomalies
- eyelid malformations
- eyelid lesions
- eyelid diseases
- eyelid tumors

- Inflammatry disorders:

- Tumors

  • Adnexal tumors
    • adenocarcinoma-eyelid
    • eccrine acrospiroma
    • sebaceous gland adenoma-eyelid
    • eccrine carcinoma
    • sebaceous carcinoma-eyelid
    • sweat gland carcinoma
    • syringoma
    • trichilemmal cell tumor
    • trichilemmoma
    • trichoepithelioma
    • trichofolliculoma
  • Melanocytic tumors:
    • melanoma-eyelid
    • melanosis oculi-eyelid
    • nevi-eyelid
    • nevus of Ota-eyelid
  • Other tumors:
    • actinic keratosis-eyelid
    • basal cell carcinoma-eyelid
    • cysts-eyelid
    • hemangioma-eyelid
    • Kaposi sarcoma-eyelid
    • keratoacanthoma-eyelid
    • lymphoma-eyelid
    • Merkel cell carcinoma
    • myxoma-eyelid
    • phakomatous choristoma
    • pilomatrixoma
    • pleomorphic adenoma-eyelid
    • seborrheic keratosis
    • squamous papilloma-eyelid
    • squamous cell carcinoma-eyelid
    • xanthelasma

Components (exemples)

- palpebral conjunctiva

  • The conjunctiva consists of unkeratinized, both stratified squamous and stratified columnar epithelium, with interspersed goblet cells.
  • The epithelial layer contains blood vessels, fibrous tissue, and lymphatic channels.
  • Accessory lacrimal glands in the conjunctiva constantly produce the aqueous portion of tears.[
  • Additional cells present in the conjunctival epithelium include melanocytes, T and B cell lymphocytes.

- palpebral fissures