In advanced rickets the enlargement of the costochondral junctions may become prominent. In many cases the beading of the ribs is not only palpable but also visible as in this case. The sides of thorax become flattened and longitutional grooves develop posterior to the rosary. The sternum with its adjacent cartilages appears to be projected forward, producing the so called pigeon breast deformity. Harrison’s groove, which corresponds to the costal insertions of the diaphragm.