An ultrastructural study of a nasal haemangioendothelioma.

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Abstract
A malignant hemangioendothelioma of the nose was examined by EM. The tumor is predominantly poorly differentiated with only little evidence of its vascular ancestry identified. The cells are polygonal with a wide spectrum of organelles, including microfilaments. A conspicuous feature was the presence of cytoplasmic fenestrae developing into intracytoplasmic vacuolated spaces. The satisfactory progress of this patient is noted, and the value of EM is enabling an early and accurate diagnosis of this tumor to be made is emphasized.