Spindle cell sarcoma of the pulmonary trunk: A case report with histochemistry and electron microscopy

A further 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. Electron microscopy showed two types of cell. The more common were polyhedral with poorly arranged fibrils in the cytoplasm and an abundant fuzzy coat. About 5 per cent of the cells contained neurosecretory granules.