Table 2.

Pathologic findings in EWSR1 positively rearranged ME tumors, without an identified fusion partner

Case #	Age/Sex	Location	Morphology	Malignant Potential	IHC
12	45/F	L1 vertebral body/bone	Epithelioid, reticular, myxoid	Benign	S100+/EMA-/CK+
13	20/F	Pelvic/peri- rectal/deep	Epithelioid/spindle	Malignant	S100+/EMA+
14	13/F	Peri-ocular/deep	Undifferentiated/small blue cells	Malignant	S100+/EMA+
15	32/F	Lung	Epithelioid, myxoid	Malignant	S100+/EMA-/Ker+
16	7/F	Peri-orbital/deep	Undifferentiated/small blue cells	Malignant	S100+/EMA+/CK+
17	19/M	Sino-nasal/ deep	Plump spindle, focal epithelioid	Malignant	S100+/EMA-/CK+
18	58/F	Calf/superficial	Epithelioid, reticular, myxoid	Benign	S100+/EMA+/CK+
19	21/F	Shoulder/deep	Undifferentiated/small blue cells	Malignant	S100+/EMA+/GFAP+
20	16/F	Fibula/bone	Undifferentiated/small blue cells	Benign	S100+/EMA+
21	27/F	Lung	Small blue cells, epithelioid, clear	Benign	S100+/EMA+
22	23/M	Humerus/bone	Epithelioid, clear cells	Benign	S100+/EMA+
23	1/M	Head &neck/ deep	Epithelioid, spindle	Malignant	S100+/EMA+/CK+
24	2/F	Mediastinum/ deep	Epithelioid, rhabdoid cells	Malignant	S100+/EMA+/GFAP+
25	53/F	Index finger/ superficial	Undifferentiated/small blue cells	Malignant	S100+/EMA+/CK+
26	58/F	Chest wall/ superficial	Epithelioid, rhabdoid, myxoid	Benign	S100- /EMA+/GFAP+
27	20/M	Foot/ superficial	Spindle, epithelioid, clear cells	Benign	S100+/EMA-/CK+
28	32/M	Ankle/ superficial	Sclerotic, spindle, epithelioid	Benign	S100+/EMA+/CK+
29	26/M	Thigh/ cutaneous	Epithelioid, histiocytoid	Benign	S100+/EMA+
30	46/M	Flank/ cutaneous	Epithelioid, spindle, nested	Benign	S100+/EMA-/CK+