Table 1 Parameter analysis in the second opinion report

• Age

• Gender

• Location

• Volume

• Margins

• Intra- versus extracompartmental extension

• Multiplicity

• Presence of intralesional calcifications

• Morphological signs (fluid-fluid levels, target sign, fascicular sign, bunch of grapes, etc.)

• Signal intensity on different pulse sequences

• Inhomogeneity

• Intralesional hemorraghe

• Intralesional necrosis

• Degree (none, moderate or marked?) and pattern of enhancement (central versus peripheral with papillary projections?) on static contrast examination

• Contrast kinetics (if available) on dynamic contrast examination

• Invasion of adjacent bones and neurovascular bundles