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[Collar-button choroidal melanoma. Anatomo-radiologic correlations]
O Berges1, L Cerezal, M Sterkers
1Service d'Imagerie Médicale, Fondation A. de Rothschild, Paris.
Journal of Neuroradiology = Journal De Neuroradiologie
|March 1, 1994
Summary
Collar-button melanomas of the choroid show distinct imaging features due to ruptured Bruch's membrane. Differences in ultrasonography and MRI signals are primarily caused by varying blood supply between the tumor's head and base.
Area of Science:
- Ophthalmology
- Medical Imaging
- Oncology
Background:
- Malignant melanomas of the choroid are the most common symptomatic eye tumors in adults.
- Collar-button or mushroom shapes are characteristic, resulting from tumor rupture of Bruch's membrane.
Observation:
- Ultrasonography reveals a hyperechogenic tumor head and hypoechogenic base.
- MRI shows variable signal intensities, with pigmented melanomas typically high on T1 and low on T2.
- Color Doppler Flow Imaging (CDFI) demonstrated absent flow in the head and high flow in the base.
Findings:
- Case study of a collar-button melanoma explored with ultrasonography, CDFI, and MRI.
- Imaging differences between tumor head and base correlated with pathological findings.
- Observed imaging variations are attributed to differential blood supply constrained by Bruch's membrane rupture.
Implications:
- Understanding imaging characteristics aids in diagnosing choroidal melanomas.
- Differential blood supply is a key factor in the distinct ultrasonographic and MRI appearances of collar-button melanomas.
- Further research into vascularity's role in tumor imaging is warranted.