Enucleation and Exenteration

Definitions & Indications - Eyes Out, Why Out?

• Evisceration: Removal of intraocular contents; sclera & Extraocular Muscles (EOMs) remain.
  • Indications: Endophthalmitis, panophthalmitis (blind, painful eye), non-malignant perforating injury.
  • Offers better cosmesis & motility post-implant.
• Enucleation: Removal of entire eyeball (globe); EOMs & orbital fat preserved.
  • Indications: Intraocular malignancy (e.g., retinoblastoma, choroidal melanoma), severe irreparable trauma, painful blind eye (e.g., absolute glaucoma, phthisis bulbi), sympathetic ophthalmia (prophylaxis/treatment).
• Exenteration: Removal of globe AND orbital contents (EOMs, fat, connective tissue, ± eyelids).
  • Indications: Malignant orbital tumors (primary/secondary extension), life-threatening orbital infections (e.g., invasive fungal sinusitis, mucormycosis).
• 📌 Mnemonic: Evisceration = Emptying contents. Enucleation = Entire globe out. Exenteration = Everything out of orbit.

⭐ Evisceration is contraindicated if intraocular malignancy is suspected or cannot be ruled out, due to risk of tumor cell spillage and incomplete tumor removal.

Surgical Nuances - The Art of Removal

• Enucleation (Eyeball Removal): Globe integrity maintained.
  • Steps: Peritomy → EOMs disinserted & tagged → Optic nerve severed → Hemostasis → Implant placement → Tenon's & conjunctival closure.
  • Technique: Careful handling to prevent tumor seeding.

• Exenteration (Orbital Contents Removal):
  • Types:
    • Total: All contents + eyelids.
    • Subtotal: Spares eyelids if uninvolved.
  • Procedure: Incisions → Periosteal elevation → Apical dissection → En bloc removal → Hemostasis ± Skin graft.
• Orbital Implants: Restore volume, aid prosthesis motility.
  • Non-integrated: PMMA (Polymethylmethacrylate).
  • Integrated (Porous):
    • Hydroxyapatite (HA)
    • Porous Polyethylene (Medpor)
    • Aluminium Oxide (Alumina)
  • Sizing: Critical for cosmesis & socket health.

  ⭐ Integrated implants like Medpor or Hydroxyapatite allow fibrovascular ingrowth, offering superior motility and reduced extrusion rates compared to older PMMA implants.

Complications - The Aftermath Story

• Early (Both Procedures):
  • Hemorrhage: Orbital, retrobulbar; may lead to orbital compartment syndrome.
  • Infection: Orbital cellulitis, abscess.
  • Pain, significant edema, ecchymosis.
  • Wound dehiscence.
• Late (Enucleation):
  • Implant-related: Exposure, extrusion (most common), migration, infection.

    ⭐ Implant exposure/extrusion is the most frequent late complication following enucleation with an orbital implant.

  • Post-Enucleation Socket Syndrome (PESS): Ptosis, enophthalmos, deep superior sulcus, lower lid laxity.
  • Socket contracture, inadequate fornices for prosthesis.
  • Sympathetic ophthalmia (rare, but sight-threatening ⚠️).
• Late (Exenteration):
  • Delayed wound healing, chronic discharge, granulation tissue, fistula formation.
  • CSF leak (if orbital roof breached), meningitis.
  • Severe cosmetic deformity, major psychological impact.

Rehabilitation - Beyond The Surgery

• Initial Care: Pressure dressing (24-48 hrs), systemic antibiotics, analgesics.
• Conformer: Placed during surgery or ~1-2 weeks post-op; maintains fornices, prevents socket contraction.
• Prosthesis Fitting (Custom):
  • Ocular (post-enucleation/evisceration): ~6-8 weeks post-op.
  • Orbital (post-exenteration): Often requires adhesive or craniofacial osseointegrated implants.
• Socket Health: Lifelong hygiene; monitor for discharge, irritation, volume changes.
• Complications: Address ptosis, implant exposure/migration, socket contraction.
• Support: Psychological counseling is crucial for adjustment.

⭐ Post-Enucleation Socket Syndrome (PESS) features: enophthalmos, deep superior sulcus deformity, ptosis, lower lid laxity, and backward tilt of the prosthesis.

High‑Yield Points - ⚡ Biggest Takeaways

• Enucleation: Removal of eyeball, sparing adnexa; for intraocular tumors (retinoblastoma), painful blind eye.
• Evisceration: Removes internal contents, leaves sclera; contraindicated in malignancy due to tumor seeding risk.
• Exenteration: Radical removal of all orbital contents; for life-threatening invasive orbital malignancies.
• Porous implants (e.g., hydroxyapatite) after enucleation offer superior motility and reduced migration.
• Enucleate traumatized blind eyes promptly (within 14 days) to prevent sympathetic ophthalmia.
• Watch for implant extrusion, socket contraction, and ptosis post-operatively as key complications.