Kim Hee Kyung, Laor Tal, Racadio Judy M
Department of Radiology, Cincinnati Children's Hospital Medical Center, 3333 Burnet Ave., Cincinnati, OH 45229-3039, USA.
Pediatr Radiol. 2008 Dec;38(12):1300-5. doi: 10.1007/s00247-008-1018-3. Epub 2008 Oct 7.
Variations in the lower extremity musculature have been identified, including an anomalous origin of the medial head of the gastrocnemius muscle. Anomalies of the lateral head of the gastrocnemius muscle (LGN) have been less frequently described, especially in children.
To describe the MR imaging appearance, frequency and clinical symptoms associated with anatomic variations of the LGN in children and young adults.
A retrospective review of 465 knee MR imaging examinations was performed. The site of origin of the LGN was identified as either normal, lateral segmental anomalous origin (LSAO), or medial accessory anomalous origin (MAAO). The clinical indication for imaging was recorded.
An anatomic variation of the LGN was identified in 16 patients (3.4%). Nine patients had LSAO, and five of these had symptoms referable to or abnormalities of the patella. Seven patients had MAAO, and three of these had chronic nontraumatic knee pain.
Anatomic variations of the LGN are not rare in young patients, occurring with a frequency of 3.4% in our series. It is unknown whether these anomalies play a role in the etiology of patellofemoral pain or unexplained joint pain in children.
已发现下肢肌肉组织存在变异，包括腓肠肌内侧头的异常起源。腓肠肌外侧头（LGN）的异常较少被描述，尤其是在儿童中。
描述儿童和青年成人中LGN解剖变异的磁共振成像表现、频率及临床症状。
对465例膝关节磁共振成像检查进行回顾性分析。LGN的起源部位被确定为正常、外侧节段性异常起源（LSAO）或内侧副异常起源（MAAO）。记录成像的临床指征。
16例患者（3.4%）发现LGN解剖变异。9例为LSAO，其中5例有与髌骨相关的症状或异常。7例为MAAO，其中3例有慢性非创伤性膝关节疼痛。
LGN解剖变异在年轻患者中并不罕见，在我们的系列研究中发生率为3.4%。这些异常是否在儿童髌股关节疼痛或不明原因关节疼痛的病因中起作用尚不清楚。
