[Malignant chorioidal melanoma of the "Knapp Rønne" type (author's transl)]

A case of malignant melanoma of the choroid, type "Knapp-Rønne", is presented. Typical clinical features of this tumor are its situation close to the papilla and its tendency to early penetration of Bruch's membrane and the retina. Histopathologically numerous dilated vascular and avascular cavities, probably caused by disturbances in the blood circulation due to the strangulating effect of Bruch's membrane, constitute the distinguishing features. Clinical and histological details are discussed.