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Specimen #19 - Bisected Human Eyeball with Uveal Melanoma
This is a pathology museum specimen showing a bisected human globe (eyeball), with both halves mounted side by side in preserving fluid (likely formalin).
What You're Looking At
| Feature | Finding |
|---|---|
| Organ | Human eyeball (ocular globe) |
| Cut | Bisected (sagittal or horizontal plane) |
| Outer layer | Pale, firm sclera visible as the white outer rim |
| Interior mass | Large, solid, cream/off-white tumor filling the vitreous cavity |
| Dark spots | Heavily pigmented (melanin-rich) foci - the hallmark of melanoma |
Diagnosis: Uveal (Ocular) Melanoma
The specimen demonstrates a uveal melanoma - a malignant tumor arising from melanocytes of the uveal tract (choroid, ciliary body, or iris). Key features confirming this:
- Tumor bulk - the solid mass has completely replaced the normal vitreous humor and occupies the entire globe interior
- Melanin pigmentation - the prominent dark brown-to-black spots represent melanin-producing tumor cells, characteristic of melanoma
- Enucleation specimen - when uveal melanoma grows to this size, the eye must be surgically removed (enucleation), which is why the intact globe was available for pathological examination
- Scleral integrity - the outer sclera appears grossly intact, though microscopic extension may be present
Clinical Significance
- Uveal melanoma is the most common primary intraocular malignancy in adults
- Arises most often from the choroid (posterior uveal tract)
- At this advanced stage, the tumor has caused complete destruction of intraocular architecture and almost certainly total loss of vision in that eye prior to enucleation
- Carries significant risk of hepatic metastasis (the liver is the predominant metastatic site)
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