Fig. 8

a A 3-month-old boy with a fever and reluctance to use his right limb. Physical examination shows a swollen, red hip. Conventional imaging shows extensive destruction of the proximal right femur and swollen soft tissue. b Ultrasound of the right hip shows cortical destruction, the formation of a subperiostal fluid collection/abscess and infiltration of soft tissue. c–d Coronal T1 STIR and axial PD images show cortical destruction and fluid collection/abscess formation in bone marrow. No contrast-enhanced imaging was performed in this case. e Axial T2 FS image confirms the fluid/abscess collection with extension outside the bone