Conclusion : this study showed age - related normal variants of sternal uptake 胸骨核素浓聚灶多出现在胸骨角，稀疏缺损灶出现在胸骨下端。
2.
Abnormal results of laboratory studies may be incidental to the patient ' s primary problem or may simply represent a normal variant 须知实验室检查结果异常，对病人的主要问题可能只是偶合关系，也可能是正常变异。
3.
On this slice a common normal variant is seen which may be mis - identified as lacunar infarction or other abnormality : the widened lenticulostriate perivascular space 在此层面，有一个正常的变异可能会被认为是腔隙梗塞或其它异常：纹状体外周血管空间增宽。
