Histopathological features of conjunctival sarcoid nodules using noninvasive in vivo confocal microscopy.

choroidal melanoma. The initial ultrasonographic characteristics suggestive of a melanoma include the collar-button shape, low internal reflectivity, and moderate vascularity. The reduction in lesion thickness and change from lowmedium to medium internal reflectivity on A-scan examination across time argue against a melanoma. Whereas the collar-button shape is characteristic of a melanoma, other lesions such as choroidal metastases and disciform processes can have this configuration. We presume that the sizable preretinal fibrosis accounts for the vascularity seen on ultrasonography, and the membrane size explains the diffuse rather than expected focal nature of the vascularity. Although the long duration of the vitreous hemorrhage argues against a melanoma, the clinical picture was complicated by the use of warfarin. The dense vitreous hemorrhage seen initially as well as the changing characteristics on serial ultrasonographic examinations helped determine the ultimate diagnosis and guided the physicians in avoiding unwanted treatment.