Department of Orthopaedics and Traumatology, EHC, Morges, Vaud, Switzerland
University of Lausanne, Lausanne, Switzerland.
BMJ Case Rep. 2020 May 5;13(5):e234962. doi: 10.1136/bcr-2020-234962.
Bilateral agenesis of the long head of the biceps brachial tendon (LHB) is a very rare variation of the anatomy. We report a case of an 18-year-old man with bilateral agenesis of the long head of the biceps brachii tendon. We present initial findings, radiographical examinations and the follow-up of an unusual entity. Diagnosis of agenesis of the LHB can be challenging especially in cases of traumatic shoulder pain. It is not a very known entity because of its rareness. However, it could be associated with other congenital anomalies. The absence of the LHB is easily ignored in the diagnostic process. Clinical examination should be a pitfall, radiological examination is helpful to confirm the suspicion of LHB absence. MRI is often the first choice, although ultrasonography is cheaper and much easier to access and it is an excellent tool to visualise this anatomic variation with empty or shallow intertubercular groove.
双侧肱二头肌长头肌腱缺如（LHB）是一种非常罕见的解剖变异。我们报告了一例 18 岁男性双侧肱二头肌长头肌腱缺如的病例。我们介绍了这种不常见疾病的初始发现、影像学检查和随访结果。LHB 缺如的诊断尤其具有挑战性，尤其是在肩部创伤性疼痛的情况下。由于其罕见性，这种情况并不广为人知。然而，它可能与其他先天性异常有关。在诊断过程中，LHB 的缺失很容易被忽视。临床检查可能是一个陷阱，影像学检查有助于确认对 LHB 缺失的怀疑。MRI 通常是首选，尽管超声检查更便宜，更容易获得，并且是可视化这种解剖变异的极好工具，可显示空或浅的结节间沟。
