Soyeon Kim

A 10‐year‐old poodle with left maxillofacial osteosarcoma received volumetric modulated arc therapy delivering 32 Gy in four fractions. Treatment planning was guided by computed tomography–magnetic resonance imaging (CT–MRI) fusion for precise target delineation near the globe. Serial CT and MRI up to 12 months after treatment showed transient enlargement of intratumoral cysts with fluid–fluid levels immediately after treatment, indicating pseudoprogression, followed by marked tumor regression. Progressive cortical remodeling and re‐ossification restored normal bone contours. These findings present the value of multimodal imaging in radiotherapy planning and follow‐up of head and neck tumors to distinguish pseudoprogression from tumor growth and identify postradiation bone regeneration.

An 8-year-old Golden Retriever was referred for progressive lameness in its left hind limb. Computed tomography revealed a hypoattenuating mass with areas of necrosis and calcification, extending from the joint capsule of the left stifle to the proximal tibia. Magnetic resonance imaging revealed imaging findings indicative of synovial cell sarcoma, including the triple sign and fluid-fluid levels, which were confirmed by histopathology and immunohistochemistry. Computed tomography and magnetic resonance imaging indicated metastases to multiple sites, including the lungs, lymph nodes, muscles, bones, and myocardium. Euthanasia was performed because of the rapid clinical deterioration of the dog’s condition. This case shows imaging features of synovial cell sarcoma similar to those described in human medicine, highlighting the clinical importance of advanced imaging for assessing the extent and metastasis of synovial cell sarcoma in dogs.

Administering intraluminal fluid can improve the acoustic window for the visualization of the lumen and wall layers in the cavitary organs. Microbubbles in ultrasound contrast agents can also be used for intracavitary applications to enhance visualization of the lesion in human patients. However, there was no literature extending the clinical application of intraluminal contrast-enhanced ultrasonography (CEUS) to patients with naturally occurring diseases in veterinary medicine. This case series aims to describe the detailed application and diagnostic value of intraluminal CEUS in six clinical cases with naturally occurring gastrointestinal (GI) and urinary tract diseases.

Administering intraluminal fluid can improve the acoustic window for visualization of lumen and wall layers in the cavitary organs. Microbubbles in ultrasound contrast agents can also be used for intracavitary applications to enhance visualization of the lesion in human patients. However, there was no literature extending the clinical application of the intraluminal contrast-enhanced ultrasonography (CEUS) to patients with naturally occurring diseases in veterinary medicine. This case series aims to describe the detailed application and diagnostic value of intraluminal CEUS in six clinical cases with naturally occurring gastrointestinal (GI) and urinary tract diseases.

Saran Chhoey, Soyeon Kim, Kroesna Kang, Sath Keo, Jihye Choi. J Vet Clin 2023;40:375-81. https://doi.org/10.17555/jvc.2023.40.5.375

Geum Bong Yu, Chang Heon Choi, Jung-in Kim, Jin Dong Cho, Euntaek Yoon, Hyung Jin Choun, Jihye Choi, Soyeon Kim, Yongsik Kim, Do Hoon Oh, Hwajung Lee, Lee Yoo, Minsoo Chun. Progress in Medical Physics 2022;33:150-7. https://doi.org/10.14316/pmp.2022.33.4.150

With the increasing use of radiation therapy for treatment of canine sinonasal neoplasia, there is a need for developing low-dose CT protocols to help minimize radiation exposure. The purpose of this study was to assess the trade-off between image quality and reduced radiation exposure of a low-dose CT technique in the canine sinonasal cavity. In this prospective, experimental study, CT images of the sinonasal cavities from 10 normal Beagles were acquired using high-dose (130 kVp) or low-dose (110 kVp, 80 kVp) protocol. Radiation dose and image quality were compared. Radiation exposure measured by the volume-weighted CT dose index and dose–length product was reduced by 36% at 110 kVp and 74% at 80 kVp respectively, compared to the corresponding values at 130 kVp (P = 0.000). Low-dose protocol resulted in higher image noise and reduced signal-to-noise ratio and contrast-to-noise ratio than 130 kVp in most evaluated regions of interest (P < 0.05). CT numbers of the contrast-enhanced structures were highest at 80 kVp (P = 0.000). Conspicuity of most sinonasal structures was similar for high dose and both lower dose protocols. The results of this study indicate that 80 or 110 kVp can be used for sinonasal CT examinations to reduce radiation exposure to the patient without compromising image quality.

Kim S, et al. J Vet Sci. 2021 Jul;22(4):e57. https://doi.org/10.4142/jvs.2021.22.e57

Bae KR, et al. Korean Circ J. 2010 Jan;40(1):46-49. http://dx.doi.org/10.4070/kcj.2010.40.1.46