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A cystic amelanotic melanoma metastasis to the brain: case report
1Department of Neurosurgery, Gazi University School of Medicine, Ankara, Turkey.
Abstract:
As far as we know, cyst formation in intracranial melanoma is rare, and only 15 cases of intracranial amelanotic melanoma have been reported until now. A yellowish mass was observed in the frontal lobe. The content of the cyst consisted of old hematoma, xanthochromic fluid and necrotic tissue, was evacuated and the cyst wall was totally resected. No abnormal pigmentation was noted in the cyst wall and surrounding brain tissue. The imaging features of metastatic melanomas are distinctive due to the presence of melanin and the propensity for hemorrhage. Both hemorrhage and melanin can produce T1-weighted hyperintensity and T2-weighted signal intensity loss.
Insights
Cyst formation in intracranial amelanotic melanoma is rare. This case highlights unique imaging features and successful surgical resection of an amelanotic melanoma cyst.
Area of Science:
- Neuro-oncology
- Neurosurgery
- Radiology
Background:
- Intracranial amelanotic melanoma is exceptionally rare, with limited reported cases.
- Melanoma metastasis to the brain often presents with distinct imaging characteristics due to melanin and hemorrhage.
Observation:
- A rare case of a cystic frontal lobe mass was identified.
- The cyst contained old hematoma, xanthochromic fluid, and necrotic tissue.
- No abnormal pigmentation was observed in the cyst wall or surrounding brain tissue.
Findings:
- The amelanotic melanoma cyst presented atypically without melanin pigmentation.
- Imaging demonstrated features potentially mimicking other cystic brain lesions.
- Complete cyst wall resection was achieved surgically.
Implications:
- This case expands the understanding of rare intracranial amelanotic melanoma presentations.
- Highlights the importance of considering amelanotic melanoma in the differential diagnosis of cystic brain masses.
- Successful surgical management offers a potential therapeutic approach for such rare tumors.
