Rubinstein D, Escott E J, Hendrick L L
Department of Radiology, University of Colorado Health Sciences Center, Denver 80206, USA.
AJNR Am J Neuroradiol. 1999 Apr;20(4):583-6.
The levator claviculae muscle is an infrequently recognized variant in humans, occurring in 2% to 3% of the population, and has rarely been reported in the radiologic or anatomic literature. The importance of this muscle to radiologists is in distinguishing it from an abnormality; most commonly, cervical adenopathy. After discovering this muscle on the CT scans of two patients during routine clinical examinations, we conducted a study to determine the prevalence and appearance of the muscle on CT studies.
We evaluated 300 CT scans that adequately depicted the expected location of the muscle. The most superior level in which the muscle could be identified and the apparent location of insertion on the clavicle were recorded for all subjects in whom the muscle was detected.
Seven levator claviculae muscles were identified in six subjects (2%). It was bilateral in one, on the left in four, and on the right in one. It was identified up to the level of the transverse process of C3 in all cases. The insertion was the middle third of the clavicle for two muscles and the lateral third of the clavicle for the remaining five muscles.
Because the levator claviculae muscle will most likely be encountered during a radiologist's career, it is important to recognize this muscle as a variant and not as an abnormality.
锁骨提肌在人类中是一种较少被认识到的变异结构，在人群中的出现率为2%至3%，在放射学或解剖学文献中鲜有报道。该肌肉对于放射科医生的重要性在于将其与异常情况区分开来；最常见的是与颈部淋巴结病相鉴别。在两名患者的常规临床检查CT扫描中发现该肌肉后，我们开展了一项研究以确定CT检查中该肌肉的发生率及表现。
我们评估了300份能充分显示该肌肉预期位置的CT扫描图像。对于所有检测到该肌肉的受试者，记录其可被识别的最高层面以及在锁骨上的明显附着位置。
在6名受试者（2%）中发现了7条锁骨提肌。其中1例为双侧，4例在左侧，1例在右侧。所有病例中该肌肉均在C3横突水平以上被识别。2条肌肉附着于锁骨中1/3，其余5条肌肉附着于锁骨外1/3。
由于放射科医生在职业生涯中很可能会遇到锁骨提肌，因此将该肌肉识别为一种变异而非异常情况非常重要。
