Page 396 - Atlas of Small Animal CT and MRI

386 Atlas of Small Animal CT and MRI

Figure 3.6.10 Axillary Lipoma (Canine) CT

(a) CT, TP (b) CT, OP, RIGHT (c) CT, OP, LEFT
9y MC Coonhound with 4‐year history of progressively enlarging left axillary mass. Image a was acquired at the level of the caudal
body of the sixth cervical vertebra. Images b and c are long‐axis oblique reformatted images approximating the plane of the caudal
cervical spinal nerves near their origin. There is a large lipoma in the left axilla that distorts and displaces the left sternocephalicus
muscle medially (a: asterisk). The soft‐tissue attenuating stippling on either side of the trachea (a: arrowheads) represents components
of the brachial plexus viewed out of plane. Evaluation of adjacent images (not shown) documented the linear interconnected matrix
of nerves that comprise the plexus. Images b and c show the path of the spinal nerves as they exit the caudal cervical intervertebral
foramina (b,c: arrowheads). The lipoma in this dog did not incorporate nerves of the brachial plexus but does encroach on them and
illustrates the potential of such masses to displace or infiltrate the plexus and the radiating peripheral nerves.

References 9. Carvalho GA, Nikkhah G, Matthies C, Penkert G, Samii M.
Diagnosis of root avulsions in traumatic brachial plexus injuries:
1. Kitchell RL, Evans HE. The Spinal Nerves. In: Evans HE (ed): value of computerized tomography myelography and magnetic
Miller’s Anatomy of the Dog. Philadelphia: W.B. Saunders resonance imaging. J Neurosurg. 1997;86:69–76.
Company, 1993;829–893. 10. van Es HW, Bollen TL, van Heesewijk HP. MRI of the brachial
2. Kamath S, Venkatanarasimha N, Walsh MA, Hughes PM. MRI plexus: a pictorial review. Eur J Radiol. 2010;74:391–402.
appearance of muscle denervation. Skeletal Radiol. 2008;37: 11. Cummings JF, Lorenz MD, De Lahunta A, Washington LD.
397–404. Canine brachial plexus neuritis: a syndrome resembling serum
3. Yang LJ, Chang KW, Chung KC. A systematic review of nerve neuritis in man. Cornell Vet. 1973;63:589–617.
transfer and nerve repair for the treatment of adult upper brachial 12. Sureka J, Cherian RA, Alexander M, Thomas BP. MRI of brachial
plexus injury. Neurosurgery. 2012;71:417–429; discussion 429. plexopathies. Clin Radiol. 2009;64:208–218.
4. Forterre F, Gutmannsbauer B, Schmahl W, Matis U. [CT 13. Brehm DM, Vite CH, Steinberg HS, Haviland J, van Winkle T. A
myelography for diagnosis of brachial plexus avulsion in small retrospective evaluation of 51 cases of peripheral nerve sheath
animals]. Tierarztl Prax Ausg K Kleintiere Heimtiere. 1998;26: tumors in the dog. J Am Anim Hosp Assoc. 1995;31:349–359.
322–329. 14. Hanna FY. Primary brachial plexus neoplasia in cats. J Feline Med
5. Munoz A, Mateo I, Lorenzo V, Martinez J. Imaging diagnosis: Surg. 2013;15:338–344.
traumatic dural tear diagnosed using intrathecal gadopentate 15. Jones BR, Alley MR, Johnstone AC, Jones JM, Cahill JI,
dimeglumine. Vet Radiol Ultrasound. 2009;50:502–505. McPherson C. Nerve sheath tumours in the dog and cat. N Z Vet
6. Steinberg HS. Brachial plexus injuries and dysfunctions. Vet Clin J. 1995;43:190–196.
North Am Small Anim Pract. 1988;18:565–580. 16. Kraft S, Ehrhart EJ, Gall D, Klopp L, Gavin P, Tucker R, et al.
7. Van Soens I, Struys MM, Polis IE, Bhatti SF, Van Meervenne SA, Magnetic resonance imaging characteristics of peripheral nerve
Martle VA, et al. Magnetic stimulation of the radial nerve in dogs sheath tumors of the canine brachial plexus in 18 dogs. Vet Radiol
and cats with brachial plexus trauma: a report of 53 cases. Vet J. Ultrasound. 2007;48:1–7.
2009;182:108–113. 17. Rudich SR, Feeney DA, Anderson KL, Walter PA. Computed
8. Welch JA. Peripheral nerve injury. Semin Vet Med Surg (Small tomography of masses of the brachial plexus and contributing
Anim). 1996;11:273–284. nerve roots in dogs. Vet Radiol Ultrasound. 2004;45:46–50.

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