Abstract
A further [human] case of a spindle cell sarcoma of the pulmonary trunk is reported, with extension to the pulmonary valve and lungs. Some spindle cells contained glycogen and their cell walls acid mucosubstances. EM showed 2 types of cells. The more common were polyhedral with poorly arranged fibrils in the cytoplasm and an abundant fuzzy coat. About 5% of the cells contained neurosecretory granules.

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