Yazici B, Yazici Z
Department of Ophthalmology, Uludag University School of Medicine, Gorukle Campus, 16059 Bursa, Turkey.
Arch Ophthalmol. 2000 Oct;118(10):1381-5. doi: 10.1001/archopht.118.10.1381.
It is frequently stated in the literature that there is a common canaliculus (CC) in the lacrimal drainage system in about 90% of individuals; in the remaining 10%, the upper and lower canaliculi enter the lacrimal sac separately. To our knowledge, there is no quantitative study supporting this assumption.
To investigate the frequency of the CC and other anatomical types connecting the upper and lower canaliculi to the lacrimal sac.
We presumed that there might be 3 different types of anatomical connection between the lacrimal sac and the canaliculi. Digital subtraction macrodacryocystograms obtained from 281 patients with obstructive epiphora were reviewed, and those of 247 patients were included in the study. These patients were grouped according to the anatomical types.
Dacryocystographies were performed on 153 patients unilaterally and 94 bilaterally. We observed a CC in 321 (94.1%) of 341 lacrimal drainage systems. In 13 lacrimal drainage systems (3.8%), the CC was absent, but the upper and lower canaliculi joined at the wall of the lacrimal sac. In only 7 lacrimal drainage systems (2.0%) did the upper and lower canaliculi enter the sac separately. In 2 patients with bilateral dacryocystograms, a CC was seen on one side but not on the other side.
The frequency of separate drainage of the upper and lower canaliculi into the lacrimal sac is only 2.0%. The CC might not be present bilaterally in all individuals.
文献中经常提到，在泪道引流系统中，约90%的个体存在共同泪小管（CC）；其余10%中，上下泪小管分别进入泪囊。据我们所知，尚无定量研究支持这一假设。
研究CC以及上下泪小管与泪囊相连的其他解剖类型的出现频率。
我们推测泪囊与泪小管之间可能存在3种不同类型的解剖连接。回顾了281例阻塞性泪溢患者的数字减影泪囊造影图像，其中247例患者的图像纳入研究。这些患者根据解剖类型进行分组。
对153例患者进行了单侧泪囊造影，94例进行了双侧泪囊造影。在341个泪道引流系统中，我们观察到321个（94.1%）存在CC。在13个泪道引流系统（3.8%）中，不存在CC，但上下泪小管在泪囊壁处汇合。只有7个泪道引流系统（2.0%）中，上下泪小管分别进入泪囊。在2例双侧泪囊造影患者中，一侧可见CC，另一侧未见。
上下泪小管分别排入泪囊的频率仅为2.0%。并非所有个体双侧都存在CC。
