Table 2.

MRI characteristics of the lesions with differential diagnosis

No.	A	B	C	D	E	F	G	H	I	J	K	L	M
1	n.a.	n.a.	n.a.	n.a.	n.a.	n.a.	n.a.	n.a.	n.a.	n.a.	n.a.	n.a.	n.a.
2	Distal UA (ST)	epi	28x45x28	c-s	inf	im	h	yes	rim	yes	no	Inflammation	Vascular lesion with internal bleeding
3	n.a.	n.a.	n.a.	n.a.	n.a.	n.a.	n.a.	n.a.	n.a.	n.a.	n.a.	n.a.	n.a.
4	Inguinal (ST)	epi	29x15x35	s	wd	h	h	no	hetero	yes	no	Pathologic LN	Soft tissue tumor (synovial sarcoma, neural tumor)
5	Distal UA (ST + B)	no	29x26x11	s	inf	im	h	yes	no	no	no	Inflammation; bone sarcoma	Osteomyelitis; bone tumor (Ewing sarcoma)
6	Distal UA (ST)	epi	26x14x24	s	inf	h	h	yes	hetero	yes	no	Inflammation; STS	venous structure; hematoma
7	Proximal UA (ST)	epi	18x6x21	s	inf	im	h	yes	rim	yes	no	Inflammation; nodular fasciitis; STS	Sarcoma
8	Proximal LA (ST)	epi	37x16x22	c-s	inf	im	h	yes	hetero	yes	yes	Pathologic LN; inflammation	Sarcoma/pathologic LN
9	Axilla (ST + LN)	epi	49x75x110	s	wd	h	h	no	hetero	yes	yes	Pathologic LN; STS	Liposarcoma
10.	Knee (ST)	epi	24x25x10	s	inf	im	h	yes	homo	no	no	Nodular fasciitis; inflammation, STS	Unclear lesion

A.Location (tissue type): B: bone; LA: lower arm; UA: upper arm, ST: soft tissue; LN: lymph node

B.Fascial relation: epi: epifascial

C.Size (mm)

D.Structure: c-s: Cystic-solid; s: Solid

E.Margin:inf: infiltrative; wd: well defined

F.T1-weighted sequence, h: high; im: intermediate

G.T2-weighted sequence, h: high

H.Surrounding edema

I.Enhancement hetero: heterogenous; homo: homogenous;

J.Necrosis

K.Satellite lesion(s)

L.Differential diagnosis (internal); LN: lymph node, STS: soft tissue sarcoma

M.Differential diagnosis (external): LN: lymph node, STS: soft tissue sarcoma;

n.a.: not available;