Abnormal results of laboratory studies may be incidental to the patient's primary problem or may simply represent a normalvariant.
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。
2
As it is a normalvariant, clinically significant hemorrhage is unusual and should raise the possibility of a concomitant cavernous angioma or other vascular malformation.
因为是正常变异，临床上，明显的出血是不常见的，但伴发海绵状血管瘤和其他血管畸形的几率提高。
3
Some people even have a genetic defect in the enzymes in their liver that break down nicotine, whereby the mutant enzyme is much less effective at metabolizing nicotine than the normalvariant.