Valuation of dynamic MR imaging for diagnosis of pituitary microadenomas / 中华放射学杂志

ABSTRACT

Objective To evaluate the use of keyhole dynamic magnetic resonance (MR) imaging in evaluation of pituitary microadenomas. Methods Fifty three patients with pituitary microadenomas proved by operation or clinical findings such as headache, amenorrhea, lactating, fat or acromegaly were retrospectively studied on dynamic MR, conventional contrast enhanced MR, and unenhanced MR. Then the image data were analyzed by two experienced doctors who didn′t know the details and three degrees were made as follows grade 0, no evidence of the tumor; gradeⅠ, asymmetry signals in the pituitary; and gradeⅡ, nodulated or sheets signals in the pituitary. The grading data were compared with statistical methods. Results In dynamic MR grading system grade 0 was revealed in 1 patient, gradeⅠ in 29 patients and gradeⅡ in 23 patients. In conventional enhanced MR grade 0 in 26 patients, grade Ⅰ in 17 patients and gradeⅡin 10 patients. In conventional unenhanced MR grade 0 in 39 patients, grade Ⅰin 10 patients and grade Ⅱ in 4 patients. The diagnostic rate of dynamic MR, conventional enhanced MR, and unenhanced MR was 98.1%, 51.9%, and 26.4%, respectively. ( P