Vandevenne J E, Colpaert C G, De Schepper A M
Department of Radiology, Universitair Ziekenhuis Antwerpen, University of Antwerp, Edegem, Belgium.
Eur Radiol. 1998;8(8):1363-5. doi: 10.1007/s003300050553.
Subcutaneous granuloma annulare (SGA) is little known to radiologists. Better knowledge of this lesion may prompt accurate diagnosis. A typical case is presented with plain radiography, ultrasound and MR imaging, and is confirmed by histology. When an otherwise healthy child presents with a rapidly growing, solitary, nontender, subcutaneous soft tissue mass, located on the scalp or extensor aspect of the limbs, that radiologically presents as an indistinct radiodense and hypoechoic mass, isointense to muscle on T1- and slightly hypointense to fat on T2-weighted MR images, without calcifications, bone involvement or extracompartmental invasion, SGA should be suspected.
皮下环状肉芽肿（SGA）对放射科医生来说鲜为人知。对这种病变有更多了解可能会促使做出准确诊断。本文展示了一个典型病例的X线平片、超声和磁共振成像表现，并经组织学证实。当一个原本健康的儿童出现一个快速生长、孤立、无压痛的皮下软组织肿块，位于头皮或四肢伸侧，放射学表现为边界不清的放射致密和低回声肿块，在T1加权磁共振图像上与肌肉等信号，在T2加权图像上略低于脂肪信号，无钙化、骨质受累或间隔外侵犯时，应怀疑为皮下环状肉芽肿。
