Table 2. Histologic features of thoracic myoepithelial tumors.

Case	Borders	Architecture	Matrix	Cytomorphology	Atypia	Mitoses /2 mm2	Necrosis	LVI
1	Infiltrative	Nests, fascicles	Hyalinized	Spindle, clear cell	None/mild	6	Present	Present
2	Infiltrative	Nests	Myxoid, hyalinized	Spindle, clear cell	Moderate	1	Absent	Present
3	Well circumscribed	Sheets, fascicles	Chondroid, hyalinized	Spindle, clear cell	None/mild	<1	Present	Present
4	Well circumscribed	Sheets	Myxoid, hyalinized	Spindle, clear cell	Moderate	0	Present	Absent
5	Well circumscribed	Nests, sheets	Myxoid	Epithelioid, plasmacytoid	Moderate	0	Absent	Absent
6	Well circumscribed	Nests, sheets	Hyalinized	Epithelioid	None/mild	<1	Absent	Absent
7	Infiltrative	Nests, sheets	Hyalinized	Epithelioid, clear cell	Moderate	2	Present	Absent
8	Well circumscribed	Nests, reticular, sheets	Myxoid, hyalinized	Epithelioid, plasmacytoid	None/mild	0	Absent	Absent

LVI=lymphovascular invasion