Walker Mary, Ara Hosne, Fakoya Adegbenro O
Cellular Biology and Anatomy, Louisiana State University Health Sciences Center, Shreveport, USA.
Cureus. 2025 May 27;17(5):e84925. doi: 10.7759/cureus.84925. eCollection 2025 May.
This report describes an incredibly rare variant of the soleus, the tibiocalcaneus internus muscle of Testut, observed during routine cadaveric dissection. In our cadaveric dissection, we observed this tibiocalcaneus internus muscle of Testut as an accessory muscle in the posterior compartment of the leg, which originates at the soleal line of the tibia and travels deep to the flexor retinaculum, ending in a tendinous insertion on the medial surface of the calcaneus, medial to the tendon of Achilles. Due to the few existing reports of this anomalous finding, any occurrence warrants reporting to expand the knowledge in clinical practice. Although it remains asymptomatic during the lifetime, this variant muscle may have clinical relevance, particularly in diagnostic imaging and in cases of unexplained medial ankle pain. By understanding this rare anatomical variation, clinicians, surgeons, and radiologists could avoid misdiagnosis and unnecessary interventions.
本报告描述了在常规尸体解剖过程中观察到的比目鱼肌一种极其罕见的变异，即泰斯特氏胫跟内侧肌。在我们的尸体解剖中，我们观察到泰斯特氏胫跟内侧肌作为腿部后群肌中的一块副肌，它起于胫骨的比目鱼肌线，在屈肌支持带深面下行，止于跟骨内侧表面、跟腱内侧的腱性附着点。由于关于这一异常发现的现有报道较少，任何此类情况都值得报告，以扩充临床实践中的知识。尽管这种变异肌肉在一生中可能无症状，但它可能具有临床意义，尤其是在诊断成像以及不明原因的内踝疼痛病例中。通过了解这种罕见的解剖变异，临床医生、外科医生和放射科医生可以避免误诊和不必要的干预。
