Hospital Veterinary Clinic, Autonomous University of Barcelona, Bellaterra, Spain.
Department of Animal Medicine and Surgery, Autonomous University of Barcelona, Bellaterra, Spain.
J Feline Med Surg. 2020 Aug;22(8):673-677. doi: 10.1177/1098612X19873195. Epub 2019 Sep 5.
The aim of this study was to investigate the frequency of identification and to describe the CT features of the os penis in cats without genitourinary disorders.
CT studies from cats that underwent an abdominal or pelvic examination between October 2013 and May 2019 were reviewed retrospectively. Cats with no signs of urinary disease and with the external genitalia included in the scan were recruited. Length, width, height and pre- and post-contrast attenuation values of the os penis in soft tissue and bone algorithms were measured independently by two observers.
Twenty-three cats met the inclusion criteria. A cylindrical bone-attenuating structure inside the glans penis compatible with the os penis was visible in 20/23 (87%) cats. Mean length, width and height values were 3.48 mm × 1.41 mm × 1.37 mm in the soft tissue algorithm, and 3.26 mm × 1.15 mm × 1.06 mm in bone algorithm. The size of the os penis was not significantly different in neutered vs intact cats, but it was significantly larger in soft tissue vs bone algorithm. Age and body weight did not influence os penis size. Pre-contrast mean ± SD attenuation was 216.7 ± 69.5 Hounsfield units (HU) for soft tissue and 320.1 ± 135.9 HU for bone algorithms. Post-contrast attenuation was 289.1 ± 68.8 HU for soft tissue and 383.4 ± 130.9 HU for bone algorithms. A significant correlation between the attenuation in bone algorithm with body weight was noted, where the os penis was less attenuating with increased body weight (pre-contrast: -0.479; 0.038).
The feline os penis is commonly seen on CT images, being more frequently detected than on radiographs. Its presence should not be mistaken for uroliths in the penile urethra.
本研究旨在调查猫中阴茎骨的检出频率，并描述其 CT 特征。
回顾性分析 2013 年 10 月至 2019 年 5 月间行腹部或盆腔检查的猫的 CT 研究。选择无泌尿道疾病且外生殖器包含在扫描范围内的猫。由两位观察者独立测量阴茎骨的软组织和骨算法的长度、宽度、高度以及平扫和增强后的 CT 值。
23 只猫符合纳入标准。20/23（87%）只猫的龟头内可见与阴茎骨一致的圆柱状骨衰减结构。软组织算法的平均长度、宽度和高度值分别为 3.48mm×1.41mm×1.37mm，骨算法分别为 3.26mm×1.15mm×1.06mm。去势与未去势猫的阴茎骨大小无显著差异，但在软组织算法中比在骨算法中更大。年龄和体重均不影响阴茎骨大小。平扫时，软组织的平均 CT 值±标准差为 216.7±69.5 亨氏单位（HU），骨算法为 320.1±135.9 HU。增强后，软组织的平均 CT 值±标准差为 289.1±68.8 HU，骨算法为 383.4±130.9 HU。骨算法的衰减值与体重呈显著负相关，即随着体重增加，阴茎骨的衰减值越低（平扫：-0.479；P=0.038）。
猫的阴茎骨在 CT 图像上常见，比在 X 线片上更易被检测到。在阴茎尿道中，不应将其误认为是尿石。
