Abstract：
OBJECTIVE: This retrospective magnetic resonance imaging investigation aimed to obtain information related to the anatomy of the massa intermedia (MI) in an adult population.
METHODS: The work conducted on MRI views of 1058 (539 males and 519 females) healthy adult samples aged with 48.93 ± 17.63 years. Initially, the presence or absence of MI was noted, and then if present, its numbers and location in the third ventricle were recorded. Its horizontal (HDMI) and vertical (VDMI) diameters were measured on MRI views, while the cross-sectional area (CSAMI) was calculated using its diameters.
RESULTS: MI was missing in 2.6% (27 cases) of 1058 adult samples. Six subjects (0.6%) had a double MI. HDMI, VDMI and CSAMI were measured as 4.83 ± 1.01 mm, 4.86 ± 0.98 mm, and 19.11 ± 7.23 mm2, respectively. MI size did not show a significant alteration from 19 up to 49 years, but then its size distinctly decreased between 50 and 60 years. After age 60, MI dimension did not display an important change. MI was settled in the antero-superior quadrant in 929 cases (90.63% of 1025 subjects), in the postero-superior quadrant in 22 cases (2.15%), in the antero-inferior quadrant in 32 cases (3.12%), in the postero-inferior quadrant in 8 cases (0.78%), and in the central part in 34 cases (3.32%).
CONCLUSIONS: The size, position and incidence of MI were not affected by sex, and its position and incidence were not affected by adult age periods. In adults, MI size demonstrated a significant decrease in the middle age.
METHODS: The work conducted on MRI views of 1058 (539 males and 519 females) healthy adult samples aged with 48.93 ± 17.63 years. Initially, the presence or absence of MI was noted, and then if present, its numbers and location in the third ventricle were recorded. Its horizontal (HDMI) and vertical (VDMI) diameters were measured on MRI views, while the cross-sectional area (CSAMI) was calculated using its diameters.
RESULTS: MI was missing in 2.6% (27 cases) of 1058 adult samples. Six subjects (0.6%) had a double MI. HDMI, VDMI and CSAMI were measured as 4.83 ± 1.01 mm, 4.86 ± 0.98 mm, and 19.11 ± 7.23 mm2, respectively. MI size did not show a significant alteration from 19 up to 49 years, but then its size distinctly decreased between 50 and 60 years. After age 60, MI dimension did not display an important change. MI was settled in the antero-superior quadrant in 929 cases (90.63% of 1025 subjects), in the postero-superior quadrant in 22 cases (2.15%), in the antero-inferior quadrant in 32 cases (3.12%), in the postero-inferior quadrant in 8 cases (0.78%), and in the central part in 34 cases (3.32%).
CONCLUSIONS: The size, position and incidence of MI were not affected by sex, and its position and incidence were not affected by adult age periods. In adults, MI size demonstrated a significant decrease in the middle age.
摘要：
目的：这项回顾性磁共振成像研究旨在获得与成年人群中中质（MI）解剖相关的信息。
方法：对年龄为48.93±17.63岁的1058例（539例男性和519例女性）健康成人样本的MRI视图进行了研究。最初，注意到MI的存在或不存在，然后如果存在，记录其数量和在第三脑室的位置.在MRI视图上测量其水平（HDMI）和垂直（Vdmi）直径，而横截面积（CSAMI）是使用其直径计算的。
结果：1058例成人样本中，有2.6%（27例）的MI缺失。六名受试者(0.6%)患有双重MI。HDMI,Vdmi和CSAMI测量为4.83±1.01mm，4.86±0.98mm,和19.11±7.23mm2，分别。从19年到49年，MI大小没有显着变化，但是它的大小在50到60年间明显减小。60岁以后，MI尺寸没有显示出重要的变化。929例（1025例受试者中的90.63％），MI解决在前上象限。在后上象限22例(2.15%)，前下象限32例(3.12%)，后下象限8例(0.78%)，中部34例(3.32%)。
结论：大小，心肌梗死的位置和发生率不受性别影响，其位置和发病率不受成年年龄的影响。在成年人中,在中年时，MI大小显着下降。
方法：对年龄为48.93±17.63岁的1058例（539例男性和519例女性）健康成人样本的MRI视图进行了研究。最初，注意到MI的存在或不存在，然后如果存在，记录其数量和在第三脑室的位置.在MRI视图上测量其水平（HDMI）和垂直（Vdmi）直径，而横截面积（CSAMI）是使用其直径计算的。
结果：1058例成人样本中，有2.6%（27例）的MI缺失。六名受试者(0.6%)患有双重MI。HDMI,Vdmi和CSAMI测量为4.83±1.01mm，4.86±0.98mm,和19.11±7.23mm2，分别。从19年到49年，MI大小没有显着变化，但是它的大小在50到60年间明显减小。60岁以后，MI尺寸没有显示出重要的变化。929例（1025例受试者中的90.63％），MI解决在前上象限。在后上象限22例(2.15%)，前下象限32例(3.12%)，后下象限8例(0.78%)，中部34例(3.32%)。
结论：大小，心肌梗死的位置和发生率不受性别影响，其位置和发病率不受成年年龄的影响。在成年人中,在中年时，MI大小显着下降。
