Fig. 3

The presence of intra-thoracic lymph nodal hilus fat on each plane of transverse, sagittal or dorsal computed tomographic image. The nodal hilus fat was scored as 0, no evidence of nodal hilus fat (a, b, c); 1, evidence of nodal hilus fat but intranodal fat outline was not distinct (d, e, f); and 2, obvious evidence of nodal hilus fat with clear intranodal fat outline (g, h, i)