Zwingenberger Allison L, Park Shin A, Murphy Christopher J
Department of Surgical and Radiological Sciences, School of Veterinary Medicine, Davis, CA 95616, USA.
BMC Vet Res. 2014 May 22;10:116. doi: 10.1186/1746-6148-10-116.
The canine lacrimal gland (LG) and accessory lacrimal gland of the third eyelid (TEG) are responsible for production of the aqueous portion of the precorneal tear film. Immune-mediated, toxic, neoplastic, or infectious processes can affect the glands directly or can involve adjacent tissues, with secondary gland involvement. Disease affecting these glands can cause keratoconjunctivitis sicca, corneal ulcers, and loss of vision. Due to their location in the orbit, these small structures are difficult to evaluate and measure, making cross-sectional imaging an important diagnostic tool. The detailed cross-sectional imaging appearance of the LG and TEG in dogs using computed tomography (CT) has not been reported to date.
Forty-two dogs were imaged, and the length, width, and height were measured and the volume calculated for the LGs & TEGs. The glands were best visualized in contrast-enhanced CT images. The mean volume of the LG was 0.14 cm3 and the TEG was 0.1 cm3. The mean height, width, and length of the LG were, 9.36 mm, 4.29 mm, and 9.35 mm, respectively; the corresponding values for the TEG was 2.02 mm, 9.34 mm, and 7.90 mm. LG and TEG volume were positively correlated with body weight (p < 0.05).
Contrast-enhanced CT is a valuable tool for noninvasive assessment of canine lacrimal glands.
犬泪腺（LG）和第三眼睑副泪腺（TEG）负责角膜前泪膜水样部分的分泌。免疫介导、毒性、肿瘤或感染性过程可直接影响这些腺体，或累及相邻组织并继发腺体受累。影响这些腺体的疾病可导致干眼症、角膜溃疡和视力丧失。由于它们位于眼眶内，这些小结构难以评估和测量，因此横断面成像成为一种重要的诊断工具。迄今为止，尚未有关于使用计算机断层扫描（CT）对犬LG和TEG进行详细横断面成像表现的报道。
对42只犬进行了成像，测量了LG和TEG的长度、宽度和高度，并计算了其体积。在增强CT图像中，腺体显示最佳。LG的平均体积为0.14 cm³，TEG为0.1 cm³。LG的平均高度、宽度和长度分别为9.36 mm、4.29 mm和9.35 mm；TEG的相应值分别为2.02 mm、9.34 mm和7.90 mm。LG和TEG的体积与体重呈正相关（p < 0.05）。
增强CT是无创评估犬泪腺的一种有价值的工具。
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