Tyrrell P N, Davies A M
MRI Centre, Royal Orthopaedic Hospital, Birmingham, UK.
Br J Radiol. 1994 Apr;67(796):332-8. doi: 10.1259/0007-1285-67-796-332.
Fatigue fractures may be confused with malignant bone lesions on radiography and hence are periodically referred for further imaging assessment with computed tomography (CT) and magnetic resonance imaging (MRI). The appearances on MRI are characteristic although not pathognomonic. Typical findings include: intramedullary bands of low signal intensity, continuous at some point with the cortex, indicative of a fracture line; intramedullary areas of high signal on both T2-weighted and short-tau inversion recovery (STIR) images representing marrow oedema or haemorrhage, together with evidence of periosteal oedema. We present seven cases of fatigue fractures of the long bones of the lower limb and discuss the MRI findings and compare CT and MRI in imaging these lesions.
疲劳性骨折在X线片上可能会与恶性骨病变相混淆，因此会定期转诊进行计算机断层扫描（CT）和磁共振成像（MRI）的进一步影像学评估。MRI表现具有特征性，但并非特异性。典型表现包括：低信号强度的骨髓内带，在某些点与皮质连续，提示骨折线；在T2加权和短反转时间反转恢复（STIR）图像上均为高信号的骨髓内区域，代表骨髓水肿或出血，同时伴有骨膜水肿的证据。我们报告7例下肢长骨疲劳性骨折病例，讨论其MRI表现，并比较CT和MRI对这些病变的成像效果。
