[Possibilities of ultrasound biometry in the differential diagnosis of early melanomas and nevi of the choroid]. 
The authors analyse the results of echobiometry carried out in 21 patients with choroid nevi and in 8 patients with primary melanomas of the choroid, administered no treatment for this or that reason.  Nevi with a prominence of less than 1 mm were found to be the most incident, and their elevation did not increase over the course of the follow-up.  Only in two patients with nevi these formations were found elevating, this corresponding with the manifestation of clinical signs of primary melanoma.  The tumor progress was clearly seen in the patients with primary melanoma of the choroid, it was permanently elevating.