Magnetic resonance imaging findings in dogs with orbital inflammation

Abstract

Objectives: To describe MRI features of canine retrobulbar inflammation, their association with clinical findings and outcome and to assess the value of MRI in detecting orbital foreign bodies. Materials and MethOds:Clinical records of dogs with confirmed (23 of 31) and suspected (eight of 31) retrobulbar inflammation that underwent low field MRI studies were analysed retrospectively.results: Of the 31 dogs included in the study there was abscessation in 19. Extraocular myositis (27 of 31) was concurrent with strabismus in three cases. Of 25 patients with exophthalmos, 14 had concurrent optic nerve swelling and, of these, five had permanent loss of vision. There was no vision loss in patients without nerve swelling. One case of suspected retinal detachment on MRI was confirmed clinically. Extensive abnormal contrast enhancement in the temporalis, masseter and pterygoideus muscles was associated with facial (n=3) and trigeminal nerve deficits (n=1). Three patients with inflammation extending into the nasal cavity and frontal sinus (one of 31) or meningeal contrast enhancement (two of 31), showed optic and oculomotor nerve deficits. On MRI a foreign body was not visible in 20 of 31 case or "appeared likely" in 11 of 31 dogs. A foreign body was found at surgery in one case. clinical significance: MRI outlines the extent of retrobulbar inflammation. Clinical findings were associated with imaging findings. MRI overestimated the presence of foreign bodies. ttp://www.bsava.com/ M. C. Fischer et al.

Mimicking focal epileptic seizures‐episodic pain due to a facial foreign body in a puppy: Imaging characteristics and treatment

“…The diagnostic investigations we performed were similar to previous reports of migrating FB where the MRI was performed as a first diagnostic imaging procedure, 13–15 but the ultrasonographic findings were crucial to defining localisation and extension of the FB. Plant FB usually appear ultrasonographically as a spindle shape with 2–3 linear echogenic interfaces in the soft tissues 16 .…”

Migrating grass awn within the intraconal part of the retrobulbar space in a dog

“…In a study of 25 cases of orbital disease, MRI-enabled identification of wooden foreign bodies and their surrounding tissue reactions which were not visible with any other imaging modalities (Daniel & Mitchell 1999, Betbeze 2015. In a report regarding MRI findings in dogs with orbital inflammation, MRI findings appeared to correlate well with clinical findings but may have overestimated the presence of foreign bodies, leading to negative explores in 10 of 11 dogs (Fischer et al 2019).…”

Uso De Imagens Para Diagnóstico De Afecções Oculares – Revisão De Literatura

“…e Zootec. 2021; v28: 001-013 exemplo (20). A avaliação de nervos cranianos torna-se possível, como em casos de oftalmoplegia e oftalmoparesia, onde objetiva-se investigar o nervo oculomotor (21).…”