Endosonography of the adrenal glands: normal size--pathological findings

Transabdominal sonography of the adrenal glands frequently is non-successful. It was the aim of this project to improve the imaging of the adrenal glands using high resolution sonography in order to obtain information about even small changes in these organs. Therefore, endosonographic imaging was investigated using an endosonoscope PENTAX FG32UA. The correct identification of the adrenal glands was examined in five human cadavers. A total of 58 patients with 113 adrenal glands (in 3 cases history of unilateral adrenalectomy) were investigated. 109 adrenal glands (97%) were identified and evaluated. Healthy adrenal glands are slightly hyperechoich and regarding their echogeneity comparable to other endocrine organs such as the testes or the thyroid. Adrenal size can be determined as largest cross sectional area and was found to be 216 +/- 93 mm2 right and 231 +/- 98 mm2 left. In the adrenal glands which could be imaged by endosonography, all findings detected by CT (n = 33) or MRI (n = 19) could also be demonstrated endosonographically. Additional information as compared to CT/MRI was obtained in 7 out of 33 and in 6 out of 19 patients. This concerns in particular differentiation between tumor and hyperplasia and detection of small adrenal adenomas. High resolution endosonography of the adrenal glands can provide information about adrenal gland morphology which cannot be obtained by any other diagnostic approach.