= BONE BRUISE

= acute bone injury in children

Path: subcortical trabecular microfractures → intraosseous hemorrhage + edema WITHOUT cortical fracture line

• chronic pain ← persistently elevated intraosseous pressure

Radiograph / CT:

• invisible

MR (fat-suppression!):

• high T2 signal intensity = marrow edema + hemorrhage

Prognosis: healing in 12–16 weeks (much longer than for a typical cortical fracture)

Cx: insufficiency fracture ← return to normal physical activity before complete healing