Intermediate vascular lesions formerly included spindle cell haemangioendothelioma, endovascular papillary angioendothelioma (Dabska tumour) and epithelioid haemangioendothelioma.
It is nowadays recognized that spindle cell haemangioendothelioma is an entirely benign, non-recurring lesion which has been renamed spindle cell haemangioma (see skin volume).
Similarly, it is now appreciated that as many as 20–30% of epithelioid haemangioendotheliomas may give rise to distant metastases (albeit the rate is lower in cytologically bland examples) and hence these tumours have been redesignated as malignant.
Intermediate vascular tumours are now subcategorized into locally aggressive and rarely metastasizing subsets.
Types
spindle cell hemangioendothelioma
endovascular papillary angioendothelioma (Dabska tumour)
epithelioid haemangioendothelioma.