Department of Radiology, Cincinnati Children's Hospital Medical Center, 3333 Burnet Ave., Cincinnati, OH 45229-3039, USA.
Pediatr Radiol. 2010 Jul;40(7):1190-6. doi: 10.1007/s00247-009-1494-0. Epub 2009 Dec 15.
The bare spot of the glenoid fossa is a normal cartilage defect seen frequently in adults. It has been used on arthroscopy as a landmark for the center of the glenoid fossa. There are no reports of this variant in children, but we have noted it on some pediatric clinical shoulder MRI studies.
Our main purpose is to evaluate the incidence of the bare spot in children and define location and MRI features.
Shoulder MRI studies (total 570) from 2004 to 2008 were reviewed. Children were divided into two age groups: group 1, 0-10 years (n = 200), group 2, 11-20 years (n = 370).
A total of 12 bare spots (2.1%) were identified; all were seen in group 2. Eight (67%) were central and four were eccentric in the glenoid fossa. All showed a well-marginated focal cartilage defect containing hyperintense joint fluid or contrast agent. Three also had air.
The bare spot is seen in children. The absence in children younger than 10 years and the low incidence in the second decade support the proposed acquired nature. Familiarity with this finding is important so as not to misinterpret it as a pathologic condition.
关节盂的光裸区是一种常见于成年人的正常软骨缺损，在关节镜检查中被用作关节盂中心的标志。目前尚未有儿童出现这种变异的报道，但我们在一些儿科临床肩部 MRI 研究中注意到了这一点。
我们的主要目的是评估儿童中光裸区的发生率，并确定其位置和 MRI 特征。
回顾了 2004 年至 2008 年的肩部 MRI 研究（共 570 例）。将儿童分为两组：0-10 岁组（n = 200）和 11-20 岁组（n = 370）。
共发现 12 个光裸区（2.1%），均见于 11-20 岁组。8 个（67%）位于关节盂中央，4 个位于偏心位置。所有光裸区均表现为边界清楚的局灶性软骨缺损，内含高信号关节液或对比剂。其中 3 个还存在积气。
儿童中可见光裸区。10 岁以下儿童中未见光裸区，第二个十年发病率低，支持其为后天获得性的特征。熟悉这一发现很重要，以免误诊为病理情况。
