Surgical removal of a microchip from a puppy’s spinal canal

Summary

A 1.6 kg, six-week-old Tibetan Terrier was admitted with a 12-hours history of acute onset of progressive tetraparesis following insertion of a microchip to the dorsal cervical region. Neurological examination indicated a lesion to the Ce₁ to Ce₅ spinal cord segments. Radiographic examination confirmed the intra-spinal location of a microchip foreign body at the level of the second cervical vertebra. Microchip removal was achieved following dorsal hemi-laminectomy; significant intra-operative haemorrhage was encountered. The puppy was ambulatory at day seven. Follow-up telephone interview 18 months postoperatively confirmed that the patient had made a good recovery although it had a mild residual right- sided torticollis.

Keywords

Microchip - foreign body - spine - cervical - hemi-laminectomy

• References

• 1 Fooks AR, McElhinney LM, Brookes SM. et al. Rabies antibody testing and the UK pet travel scheme. Vet Rec 2002; 150: 428-430.
• 2 Microchip Advisory Group, UK www.bsava store.com. Last accessed 05.06.08
• 3 Sorensen MA, Buss MS, Tyler JW. Accuracy of microchip identification in dogs and cats. J Am Vet Med Assoc 1995; 207: 766-767.
• 4 Platt S, Wieczorek L, Dennis R. et al. Spinal cord injury from incorrect microchip placement in a cat. J Fel Med Surg 2007; 9: 157-160.
• 5 Funkquist B. Decompression laminectomy for cervical disk protrusion in the dog. Acta Vet Scand 1962; 3: 88-101.
• 6 Elcock LE, Stuart BP, Wahle BS. et al. Tumours in long-term rat studies associated with microchip animal identification devices. Exp Toxicol Path-ol 2001; 52: 483-491.
• 7 Tillmann T, Kamino K, Dasenbrock C. et al. Sub-cutaneous soft tissue tumours at the site of the implanted microchips in mice. Exp Toxicol Path-ol 1997; 49: 197-200.
• 8 Blanchard KT, Barthel C, French JE. et al. Transponder-induced sarcoma in the heterozygous p53 +/- mouse. Toxicol Pathol 1999; 27: 519-527.
• 9 Vascellari M, Mutinelli F, Cossettini R. et al. Liposarcoma at the site of an implanted microchip in a dog. Vet J 2004; 168: 188-190.
• 10 Trees AJ. Death from a Grass Seed. Vet Rec 1970; October 450
• 11 Brockman DJ, Trout NJ. Epidural migration of a suspected pharyngeal foreign body in a dog. Vet Rec 1991; 128: 210-211.
• 12 Rayward RM. Acute onset quadriparesis as a sequela to an oropharyngeal stick injury. J Small Anim Pract 2002; 43: 295-298.
• 13 Leskovar A, Coates JR, Russell KE. et al. Surgical removal of an intramedullary spinal cord foreign body granuloma in a dog. J Am Anim Hosp Assoc 2003; 39: 306-310.
• 14 Young B, Klopp L, Albrecht M. et al. Imaging diagnosis: Magnetic resonance imaging of a cervical wooden foreign body in a dog. Vet Radiol Ultrasound 2004; 45: 538-541.
• 15 van der Burgt G, Dowles H. Microchip insertion in alpacas. Vet Rec 2007; 10: 204