The former involves primarily the upper lobes while the latter involves all lungfields, particularly the bases.
前者主要累及肺上叶，而后者则累及整个肺叶，尤其是肺底部。
2
Distribution of the two normal lung markings, clear lungfields and no substantive changes, hilar location and structure of the normal.
两肺纹理分布正常，肺野清晰，未见实质性病变，肺门位置、结构正常。
3
Results UIP occurred more often in males over 50 years of age. Clinical findings included progressive shortness of breath, cough, sputum and crackles over both lungfields.