Fujisawa I, Kikuchi K, Nishimura K, Togashi K, Itoh K, Noma S, Minami S, Sagoh T, Hiraoka T, Momoi T
Department of Radiology, Kyoto University School of Medicine, Japan.
Radiology. 1987 Nov;165(2):487-9. doi: 10.1148/radiology.165.2.3659371.
Magnetic resonance (MR) imaging was performed in ten patients with pituitary stalk transection who had idiopathic pituitary dwarfism. Contiguous sagittal T1-weighted images were obtained in all cases, and, in some, axial or coronal images were taken for further evaluation. On MR images, normal anterior and posterior lobes of the pituitary gland can be clearly differentiated because the posterior lobe has a characteristic high intensity on T1-weighted images. In the ten patients, the high-intensity posterior lobe was not seen, but a similar high signal intensity was observed at the proximal stump in seven patients. This high-intensity area is the newly formed ectopic posterior lobe, which secretes antidiuretic hormone just as the posterior lobe would. When the ectopic lobe completely compensates for the impaired posterior lobe, endocrinologic data indicate normal posterior lobe function. However, MR imaging can reveal the transection of the pituitary stalk and formation of the ectopic lobe.
对10例患有特发性垂体性侏儒症的垂体柄横断患者进行了磁共振（MR）成像检查。所有病例均获取了连续的矢状位T1加权图像，部分病例还拍摄了轴位或冠状位图像以进行进一步评估。在MR图像上，垂体的正常前叶和后叶能够清晰区分，因为后叶在T1加权图像上具有特征性的高信号强度。在这10例患者中，未见到高信号强度的后叶，但在7例患者的近端残端观察到了类似的高信号强度。这个高信号强度区域是新形成的异位后叶，它与后叶一样分泌抗利尿激素。当异位叶完全代偿受损的后叶时，内分泌学数据表明后叶功能正常。然而，MR成像能够显示垂体柄的横断以及异位叶的形成。
