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Intrathoracic rib (type Ib). MDCT (A - three-dimensional reconstruction; B - axial view; C - sagittal maximum intensity projection) showing a supernumerary rib (red arrows) originating in the posterior portion of a short left third rib (white arrows), with a lateral, inferior oblique path to the pulmonary parenchyma. Note that the rib has no visible medullary cavity. No changes were identified in the posterior vertebral bodies or ribs.
