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==Microscopic== | ==Microscopic== | ||
Features: | Features: | ||
*Spindle cell lesion. | |||
**Occasionally an epithelioid lesion. | |||
*Very many small capillaries of irregular shape lined with: | *Very many small capillaries of irregular shape lined with: | ||
**Pleomorphic nuclei. | **Pleomorphic nuclei - '''important'''. | ||
***May have hobnail morphology. | ***May have hobnail morphology. | ||
**Usually "red" at low power - due to many RBCs - '''important'''. | |||
*Mitoses. | *Mitoses. | ||
*Cytoplasmic vacuoles. | *Cytoplasmic vacuoles. |
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