Eyelid margin basal cell carcinoma
Periocular BCC; eyelid BCC; canthal BCC; lid margin basal cell carcinoma
BCC of the eyelid margin is the commonest periocular malignancy and a special-site cancer that demands precise tissue-sparing surgery to preserve the lid margin, the canalicular system and ocular function. Mohs micrographic surgery is the treatment of choice for most eyelid BCCs in the UK, providing the lowest recurrence rates and the smallest histologically-confirmed defects. Reconstruction depends on which lamellae are missing (anterior / posterior / both), defect size and patient factors. The lower lid is involved in approximately 70% of cases, with the medial canthus second most common — a particularly challenging site due to canalicular involvement risk.
Eyelid anatomy and BCC biology
- Eyelid has two functional lamellae: anterior (skin + orbicularis oculi muscle) and posterior (tarsus + conjunctiva), plus the gray line at the margin.
- Canalicular system — superior and inferior puncta + canaliculi → common canaliculus → lacrimal sac → nasolacrimal duct.
- Lower lid 65–75% of eyelid BCC; medial canthus 15–20%; upper lid 5–10%; lateral canthus < 5%.
- Lid-margin BCC is more often nodular (nodulocystic) but morphoeic / infiltrative subtypes are over-represented at the medial canthus.
Clinical features
- Slow-growing pearly papule or nodule with telangiectasia on the lid margin, often with loss of cilia.
- Ulceration ("rodent ulcer") in larger lesions.
- Madarosis (lash loss) is a useful early sign of lid-margin involvement.
- Canalicular involvement — epiphora, mucoid discharge — suggests proximal extension.
- Examination under operating loupes with eversion to assess posterior lamella.
Mohs micrographic surgery
- Mohs is the treatment of choice for most eyelid BCCs in UK practice:
- Highest cure rate (> 99% at 5 years for primary BCC; ~ 95% for recurrent).
- Tissue-sparing — minimises lid-margin and canalicular sacrifice.
- Real-time histological control allows immediate definitive reconstruction.
- Indications — recurrent BCC, morphoeic / infiltrative / basosquamous subtype, > 1 cm, ill-defined borders, deep / extensive disease.
- Alternative — wide local excision with frozen section / staged excision and delayed reconstruction.
- Radiotherapy reserved for non-surgical candidates or as adjuvant for high-risk disease.
Reconstruction principles
- Reconstruction strategy depends on which lamellae are missing and the proportion of lid involved:
- Anterior lamella only, small defect — primary closure, FTSG or local skin flap (e.g. nasolabial advancement).
- Anterior lamella, larger defect — local rotation / transposition flap (Tripier, Mustardé cheek rotation, glabellar transposition for medial canthal defects).
- Posterior lamella, < 25% — direct primary closure with canthotomy / cantholysis as needed.
- Posterior lamella, 25–50% — Tenzel semicircular flap (lateral cantholysis with rotation).
- Posterior lamella, > 50% — Hughes tarsoconjunctival flap (upper-to-lower) for lower lid, Cutler-Beard for full-thickness upper lid.
- Full-thickness loss > 75% — composite reconstruction with hard-palate graft, free flap, prosthetic eyelid.
- Canalicular involvement — silicone (mini-Monoka or bicanalicular) stenting at the time of reconstruction; canaliculocystorhinostomy in selected cases.
- Specialist oculoplastic surgeon involvement is essential for medial canthal disease, posterior lamellar defects and any canalicular system involvement.
Follow-up
- 5-year recurrence rate < 1% after Mohs for primary BCC; ~ 5% for recurrent or high-risk.
- 6-monthly clinical examination for 2 years; annual for 5 years total.
- Patient counselling on photoprotection and self-examination; UV-protective sunglasses.
- Multiple eyelid BCCs / very young patient — consider Gorlin syndrome; refer for genetic assessment.
References
- Spencer WH, Allen JL, Rubin PA. Eyelid reconstruction following resection for eyelid carcinoma. Ophthalmology; 2001.
- Karip B, Tezer M. Mohs micrographic surgery for periocular BCC — outcomes. Eur J Plast Surg; 2018.
- Nasr I, McGrath EJ, Harwood CA et al. British Association of Dermatologists guidelines for the management of adults with basal cell carcinoma 2021. Br J Dermatol. 2021;185(5):899-920.
- BOPSS oculoplastic surgical guidelines.
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