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Surgical Management of Ceruminous Adenoma in a Dog.

Abstract

A female Spitz dog was presented with otic discharge from left ear for past two months. Clinical examination revealed multiple small, nodular growths in vertical ear canal. The multiple nodular growths were surgically excised using electrocautery. Histologically the tumor was confirmed as ceruminous gland adenoma. The animal recovered uneventfully.

Keywords : Ceruminous adenoma; dog; surgical management

Introduction

Ceruminous glands are modified apocrine glands found in deep dermis of external ear canal that produce a brown waxy material and cerumen. The most common neoplasm of ear canal is ceruminal gland in origin (London, 1996). The present paper reports surgical management of ceruminous gland adenoma in a dog.

History and Diagnosis

A nine year old female Spitz dog weighing 10 kg was presented with history of discharge from left ear for past two month. Clinical examination revealed multiple, pink coloured small nodular growths (Fig. 1) in the vertical ear canal with mild discharge from ear. Complete blood count and serum biochemistry analysis was done. All hematobiochemical values were within the normal range

Treatment and Discussion

Animal was given pre-operative oral antibiotic of Cefpodoxime (Cefpet (a)) @ 10 mg/kg b.wt. for 5 days, Prednisolone @ 0.5 mg/kg b.wt., ear drops Ofloxacin and Betamethasone (Pomisol (a)) thrice daily. Animal was fasted for 12 hrs, premedicated with Atropine sulphate @ 0.02 mg/kg b.wt., sedated with Xylazine hydrochloride @ 1mg/kg b.wt. Animal was positioned in right lateral recumbency. Anesthesia was induced with Ketamine hydrochloride @ 5mg/kg b.wt. and Diazepam @ 0.5 mg/kg b.wt. Multiple, pink coloured, nodular growths were excised by using surgical electrocautery (Fig. 2). Some of the tumor masses were found extended deep into the vertical ear canal. So a straight skin incision was made starting from tragus and extending ventrally to about 3 cm exposing the lateral cartilaginous wall of vertical ear canal. The deep nodular growths were also removed by using electrocautery. Subcutaneous layer sutured using PG[A.sub.1] and skin sutured using silk.

Post-operatively oral anitibiotics and ear drops were continued for 5 days. Dressing of surgical site was done on alternate days. Sutures were removed on 10 (th) post-operative day. The excised tumor mass was fixed in 10 percent formalin. Formalin fixed samples were processed and paraffin embedded tissue sections were cut into 4 [micro]m thickness and stained with Hematoxylin and Eosin (H&E). Microscopical examination revealed the neoplastic cells formed as acini and they become cystic type. The neoplastic cells were single to double layered, cuboidal to low columnar epithelial cells and abundant eosinophilic cytoplasm and lumen contained copper coloured secretions. Based on the finding, tumor was confirmed as ceruminous gland adenoma.

Ceruminous gland adenomas are rare neoplastic skin disease of ear of unknown etiology (Moisan and Watson, 1996). These neoplasms are more common in cat than in dog (Scott, 2001). There is increased risk for tumors in animals that have a history of chronic otitis. Jabara (1976) reported that ceruminous gland tumors were uncommon in dogs and majorities were adenomas. In the present case the tumor was recorded in a 9 year old dog is in accordance with Jabora (1976) who reported that tumors are most commonly seen in middle aged to older animals. In the present case, tumor was multiple, pink, nodular growth and discharge from the ear is in agreement with earlier reports (Rajini, 2005).

Surgical excision is the recommended treatment for cats and dogs with ear canal tumors. The extent of surgical excision depends on location and type of tumor. Benign tumors confined to vertical ear canal can be excised with vertical ear canal resection, whereas total ear canal resection and lateral bulla osteotomy are required for benign tumors arising from horizontal ear canal and all malignant tumours.

In the present case, tumors present in external ear canal was resected using electrocautery and as the tumour extended deep into vertical ear canal, resection of vertical ear canal was also done and nodules were removed.

Goldschmidt and Hendrick (2002) reported that ceruminous gland adenoma had neoplastic cells arranged in acini and becomes cystic contains copper coloured fluids is in agreement with present case.

References

Goldschmidt, M.H. and Hendrick, M.J. (2002). Tumours of the skin and soft tissues. In: Tumours in Domestic Animals. Meuten, D.J. 4th Edn. Iowa State Press, Ames, p. 73-74.

Jabara, A.G.A. (1976). Mixed tumour and an adenoma both of ceruminous gland origin in a dog. Aust. Vet. J. 52: 590-92.

London, C.A., Dubilzeig, R.R., Vail, D.M., Ogilvie, G.K., Hahn, K.A., Brewer, W.G., Hammer, A.S., O'Keefe, D.A., Chun, R., McEntee, M.C., McCaw, D.L., Fox, L.E., Norris, A.M. and Klausner, J.S. (1996). Evaluation of dogs and cats with tumors of the ear canal: 145 cases (1978-1992). J. Am. Vet. Med. Assoc. 208:1413-18.

Moisan, P.G. and Watson, G.L. (1996). Ceruminous gland tumors in dogs and cats: a review of 124 cases. J. Am. Anim. Hosp. Assoc. 32: 448-52.

Rajni, F.K. (2005). Cytological, histological and immuno histochemical evaluation of skin tumours in canines. Post Graduate Thesis Submitted, Tamilnadu Veterinary and Animal Sciences University, Chennai.

Scott, D., Miller,W., Griffin, C. Muller and Kirk (2001). Small Animal Dermatology, 6th Edn., W.B. Saunders Company. p: 624-27.

S. Kokila (1), A.R. Ninu and K. Gopal

Department of Veterinary Surgery and Radiology Veterinary College and Research Institute (VCRI) Tamil Nadu Veterinary and Animal Sciences University (TANUVAS) Tirunelveli - 627358 (Tamil Nadu)

(1.) Assistant Professor and Corresponding author. E-mail: kokvet@yahoo.co.in

(a) - Brand of Intas Animal Health, Ahmedabad
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Title Annotation:Short Communication
Author:Kokila, S.; Ninu, A.R.; Gopal, K.
Publication:Intas Polivet
Article Type:Report
Date:Jul 1, 2016
Words:932
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