9-year-old male with history of leukemia receiving treatment now with bilateral hip pain, evaluate for avascular necrosis. Right KneeMENISCI: Medial and lateral menisci are intact.ARTICULAR CARTILAGE AND BONE: Small focus of increased edema is seen within the lateral aspect of the lateral femoral condyle (series 701, image 8 and series 1001, image 12). No additional bone marrow signal abnormalities are identified. The articular cartilage appears to be intact. No acute fracture.LIGAMENTS: PCL, ACL, MCL, and LCL are intact. EXTENSOR MECHANISM: Extensor mechanism is intactADDITIONAL
1. Left knee: Proximal medial tibial metaphysis focus of low signal on T1 is associated with increased signal on T2. These findings are nonspecific but may reflect tibial metaphyseal edema, infarct, or leukemia infiltration. 2. Right Knee: Increased T2 hyperintensity in the right lateral femoral condyle and left medial femoral condyle without associated T1 low signal. These findings are nonspecific, but may reflect edema. 