Table II.

Clinical, imaging, pathological and molecular data of intramuscular haemangiomas

Variable	Description	Missing data
Clinical data
Size (cm2), mean (IQR)	19.5 (9.0-48.8)	21
Pain, n (%)	12 (26.1)	29
Location		0
Head and neck	33 (44.0)
Trunk	15 (20.0)
Lower limb	15 (20.0)
Upper limb	12 (16.0)
Progressive increase	36 (90.0)	35
Rapid increase	4 (10.0)
Warmth, n (%)	0	29
Pulsatility (on palpation), n (%)	3 (6.5)	29
Firm consistency, n (%)	23 (59.0)	36
Soft consistency, n (%)	13 (33.3)
Identified triggering factor, n (%)	7 (14.3)	26
Trauma	5
Pregnancy	1
Air travel	1
Imaging data
MRI, described in n cases (%)	47 (62.7)	28
Well-delineated mass*	10 (76.3)
Heterogeneity/homogeneity*
Heterogeneous mass	23 (88.5)
Homogeneous mass	3 (11.5)
T1-weighted sequence description*
Hyperintense signals	3 (9.4)
Hypointense signals	2 (6.2)
Isointense signal	27 (84.4)
T2-weighted sequence description*	31 (100)
Hyperintense signals
Contrast enhancement*	34 (100)
Flow voids*	21 (100)
Signal modifications of the underlying bone*	2 (4.1)
CT scan, described in n cases (%)	22 (29.3)	53
Well-delineated mass*	4 (66.7)
Heterogeneous mass*	4 (100)
Contrast enhancement*	9 (100)
Angiogram, n (%)	27 (36.0)	48
Pathology and molecular data
Biopsy/excision performed, n (%)	68 (90.7)	7
Presence of adipose tissue*	31 (93.9)
Description of the vessel size*
Small vessels only	42 (67.7)
Small and other vessels	20 (32.3)
Search of somatic mutations*	6
MAP2K1 gene	4
KRAS gene	2

^*For each of these variables, percentages were calculated as number of patients with the positive variable to the number patients for whom this variable was described. Thus, the denominator was not the same for each because all variables were not reported in all patients (i.e. percentage calculations take into account missing data for each variable).

IQR: interquartile range; CT: computed tomography; MRI: magnetic resonance imaging.