10 year old male patient with culture negative left hip osteomyelitis. PELVIS:PROSTATE/SEMINAL VESICLES: No significant abnormality noted.BLADDER: No significant abnormality noted.LYMPH NODES: There are small bilateral inguinal lymph nodes.BOWEL, MESENTERY: No significant abnormality noted.BONES, SOFT TISSUES: There is a region of signal abnormality with decreased T1 signal, increased T2 signal, and enhancement predominantly within the posterior left acetabulum with extension into the left iliac bone and the left ischium; these findings are compatible with osteomyelitis. Interval development of a 1.9 x 0.5 cm peripherally enhancing collection within the superior and posterior left acetabulum which is compatible with abscess formation. This collection abuts the cortex. Two additional cystic foci inferior to this new collection which were present on the prior OSH study are less distinct on this examination.Linear focus of low signal intensity within the left femoral neck is presumably related to prior biopsy.No discrete drainable fluid collection is identified in the surrounding soft tissues of the hip. There is enhancement of the left synovium and trace fluid within the left hip joint. Bone marrow signal intensity within the left femur is grossly normal.OTHER: No significant abnormality noted.
Findings compatible with osteomyelitis of the left acetabulum and surrounding pelvic bones with interval intraosseous abscess formation.