Fig. 5

Presumptive intrathoracic synovial sarcoma, dog, TEM. a, a small cluster of cohesive neoplastic cells with a basal membrane between cells (grey arrow). Bar = 5 μm. b, the neoplastic cells have large numbers of rough endoplasmic reticulum (white asterisk). Bar = 1 μm. c, the neoplastic cells have desmosome junctions (black arrowheads) and microfilaments (black asterisk). Bar = 500 nm. d, the neoplastic cells have microvilli-like structures on the cell membrane (black arrows). Bar = 1 μm