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- left central (para sacroiliac joint) iliac bone shows a well defined multi-lobulated seen arising from the medial aspect of the left iliac bone, having a cortex and medulla continuous with that of the mother bone.
- projects superiorly filling the space between the left sacroiliac joint and the left transverse process of L5 vertebra and projecting posteriorly into the left erector spinae muscle.
- no associated extra-osseous soft tissue components.
- intact left sacroiliac joint.