Neoplastic angioendotheliosis.

Neoplastic angioendotheliosis is a rare disease in which malignant cells are found within numerous blood vessels throughout the body in the absence of any detectable extravascular primary malignancy. The disorder has a propensity for clinical neurological involvement despite pathological evidence of systemic spread. To date 23 patients with neurological involvement have been described. This report adds a further 3 cases. There was no definite evidence to support the theory that the malignancy arises in endothelial cells; no primary extravascular tumour was found. At present a definite conclusion about the cause of the disease cannot be made.