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Pathology of Benign Fibro-osseous Lesion of the External Ear

Dr Sampurna Roy MD           

 

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 Syn: Fibrous Dysplasia ; Ossifying Fibroma

 

The benign fibro-osseous lesions clinically represent a wide range of disorders of bone similar microscopic features.

These are relatively common in the craniofacial area particularly jaw).

Rare cases of Benign Fibro osseous lesions have been reported in the external canal of the ear.

These tumours are composed of a mixture woven bone and fibrous tissue.

There  is usually no relationship to the cartilaginous tissue or bony structures of the external auditory canal.

There is controversy among the authors as to call these lesions fibrous dysplasia or ossifying fibroma hence the name "Benign Fibro osseous lesion'' was introduced.

These are usually solitary lesions and patients present with deafness and facial palsy in some cases.

In many cases there is occlusion of the external auditory meatus.

X-ray examination, shows enlarged temporal bone together with areas of sclerosis.

Macroscopically, these are yellowish white firm osteoma-like bony tissue with cystic spaces. There may be fluid in the cystic areas.

Histologically, there are irregular trabeculae of woven bone set in dense fibrocollagenous backround. The bony trabeculae often show lack of osteoblasts at the periphery.

Differential diagnosis: Exostosis of External Ear ; Osteoma of Ear

 

Further reading

Cutaneous myositis ossificans: an appropriate descriptor for fibro-osseous lesion of the external auditory canal.

Cutaneous myositis ossificans: an appropriate descriptor for fibro-osseous lesion of the external auditory canal.

Ossifying fibroma of the temporal bone

Fibro-osseous lesions of the external auditory canal.

 

    Ear Pathology Online - Home Page           Ear Pathology Online -Index 

                                                                                    

 

Dr Sampurna Roy  MD

Consultant  Histopathologist (Kolkata - India)


 

 

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