Veterinary MedicineCell BiologyPathologyCellular PathologyNeoplasiaTumor PathologyJoint PathologyMalignant TumorsMesenchymal TumorsTumor HistopathologyTumor MorphologyIntercellular SpacesMicroscopic Tissue ExaminationSarcoma PathologySpindle Cell MorphologySpindle Cell SarcomaSpindle Cell TumorsUltrastructural CharacterizationUltrastructural Pathology