Abstract
To evaluate tympanic bulla healing after experimental lateral osteotomy in cats. Twenty adult cats were submitted to unilateral lateral bulla osteotomy and divided into two groups: cats of B1 group (n=10) were euthanized at 8 weeks and cats of B2 group (n=10), at 16 weeks postoperative. Oblique lateral radiographs taken immediately postoperative showed interruption in the contour of the external acoustic meatus of the operated bullae in all cats of both groups (McNemar test: p=0.0010*). This feature was still observed in the radiographs taken after 8 and 16 weeks postoperative (McNemar test: B1 p=0.0020*; B2 p=0.0312*). Macroscopic examination showed that the operated bullae were similar to the normal ones, with preservation of the tympanic cavity. Connective tissue at the osteotomy site was significantly found in the operated bullae in both groups (McNemar test: B1 p=0.0020*; B2 p=0.0010*). The length of connective tissue at the osteotomy site was measured by histomorphometry. There was no statistically significant difference between the values of B1 group and B2 group (Mann-Whitney test: p=0.0524). Experimental lateral osteotomy did not alter significantly the tympanic bulla conformation and complete regeneration of the tympanic bulla frequently did not occur before 16 weeks of postoperative period.
Highlights
Surgical procedureTotal ear canal ablation with lateral tympanic bulla osteotomy (TECA/LBO) is most frequently indicated for cats with neoplastic disease of the ear.[1,2,3] The most common ear tumors in these animals are ceruminous gland adenocarcinoma and squamous cell carcinoma. 1-7 The tympanic bulla in cats is divided into a dorsolateral and a ventromedial compartment by an incomplete septum in the caudomedial aspect of the smaller compartment that allows communication between the cavities
When lateral bulla osteotomy is performed, part of this septum must be removed for proper curettage and drainage of both compartments, and the surgeon has to avoid injuries to the structures of hearing and balance or to the nerve tracts that cross the middle ear. 2,8 A better understanding of the consequences of TECA/LBO may improve the management of recurrences, reoperations and changes in middle-ear function, since this procedure is increasingly common in cats
No cats in our study showed clinical signs of Horner’s syndrome, possibly because during surgery the inner septum was carefully perforated but not removed
Summary
Surgical procedureTotal ear canal ablation with lateral tympanic bulla osteotomy (TECA/LBO) is most frequently indicated for cats with neoplastic disease of the ear.[1,2,3] The most common ear tumors in these animals are ceruminous gland adenocarcinoma and squamous cell carcinoma. 1-7 The tympanic bulla in cats is divided into a dorsolateral and a ventromedial compartment by an incomplete septum in the caudomedial aspect of the smaller compartment that allows communication between the cavities. Total ear canal ablation with lateral tympanic bulla osteotomy (TECA/LBO) is most frequently indicated for cats with neoplastic disease of the ear.[1,2,3] The most common ear tumors in these animals are ceruminous gland adenocarcinoma and squamous cell carcinoma. When lateral bulla osteotomy is performed, part of this septum must be removed for proper curettage and drainage of both compartments, and the surgeon has to avoid injuries to the structures of hearing and balance or to the nerve tracts that cross the middle ear. 2,8 A better understanding of the consequences of TECA/LBO may improve the management of recurrences, reoperations and changes in middle-ear function, since this procedure is increasingly common in cats. Risks of nerve and inner ear damage were assessed
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