Bone Marrow Aspiration
A special hollow needle is used to remove a sample of marrow from inside the hip bone. A pathologist examines the marrow under a microscope to look for signs of retinoblastoma.
Bone marrow aspiration can be done under local anaesthetic in an outpatient treatment room. The procedure is less traumatic for a young child when done under general anaesthetic. Many hospitals will co-ordinate so the sample can be drawn during an EUA when your child is asleep.
Marrow is usually taken from the top of the hip bone (pelvis), which is just under the skin and rich in marrow. Rarely, marrow is taken from other bones, such as the tibia (long bone in the lower leg) or sternum (breast bone).