Conjunctival Melanoma Metastasis to the Contralateral Orbit

Area of Science:

• Ophthalmology
• Oncology
• Pathology

Background:

• Malignant melanoma, primarily affecting individuals of white descent, is a potentially fatal condition.
• Distant metastases commonly involve the lungs, liver, and brain, and can arise independently of regional disease.
• Metastasis of conjunctival melanoma to the contralateral orbit has not been previously documented.

Observation:

• A 60-year-old male presented with a conjunctival mass invading both orbits, 11 months post-resection of a left conjunctival neoplasm.
• Histopathology and immunohistochemistry confirmed metastatic conjunctival melanoma.
• The patient exhibited contralateral orbital metastases without evidence of local recurrence.

Findings:

• Conjunctival melanoma demonstrated the capacity to metastasize to the contralateral orbit.
• The patient received adjuvant chemotherapy (vincristine, nedaplatin, dacarbazine) for five cycles.
• Despite treatment, the patient succumbed to the disease eight months post-surgery.

Implications:

• This case highlights the potential for unusual metastatic patterns in malignant conjunctival melanoma.
• Mandatory histopathologic evaluation is essential for accurate diagnosis of orbital masses in patients with prior malignancy.
• Distinguishing between new primary tumors, metastases, and benign lesions is critical for appropriate patient management.