The nodules may be numerous and distributed throughout both lungs.However, in up to 50% of patients, the nodularity may be scanty or focal, localized to small areas in one or both lungs.

• 结节可能数量极多，遍布双侧全部肺野，也有近50%25的患者病灶局限分布，仅于单侧/双侧的部分肺野。