Table 1. IMPeTUs Lesion type . Site .... | American Society of Hematology

Table 1.

IMPeTUs

Lesion type	Site	Number	Grading
Diffuse	BM (“A” if hypermetabolism in limbs and ribs)	—	DS
F (focal)	S (skull)	X1 (n = 0)
	Sp (spine)	X2 (n = 1-3)
	Ex-Sp (extraspine)	X3 (n = 4-10)
		X4 (n > 10)
L (lytic)			—
Fr (fractures)		≥1
PSD			DS
EMD	N (nodal)∗
	EN (extranodal)†

Lesion type	Site	Number	Grading
Diffuse	BM (“A” if hypermetabolism in limbs and ribs)	—	DS
F (focal)	S (skull)	X1 (n = 0)
	Sp (spine)	X2 (n = 1-3)
	Ex-Sp (extraspine)	X3 (n = 4-10)
		X4 (n > 10)
L (lytic)			—
Fr (fractures)		≥1
PSD			DS
EMD	N (nodal)∗
	EN (extranodal)†

Adapted from Nanni et al²⁷ with permission.

For nodal N disease: C, cervical; SC, supraclavicular; M, mediastinal; Ax, axillary; Rp, retroperitoneal; Mes, mesentery; In, inguinal.

For extranodal disease: Li, liver; Mus, muscles; Spl, spleen; Sk, skin; Oth, other.