[9.] Radiotherapy of a recurrent ossifying fibroma
in the paranasal sinuses of a horse.
The histological study of the specimen after simple resection confirmed the diagnosis of peripheral ossifying fibroma
. At 1-yr recall, the gingival tissues were healthy with successful healing and no more recurrence.
occurs mostly in craniofacial bones and is generally categorized into two types, central and POF.
Benign lesions (N=21) 1 Inverted papilloma 8 38.09% 4 2 Capillary Haemangioma 6 28.57% 4 3 Angiofibroma 5 23.80% 5 4 Ossifying fibroma
2 9.52% 1 Malignant lesions (N=14) 1 Squamous cell ca-maxilla 5 35.71% 3 2 Olfactory neruoblasoma 3 21.42% 2 3 Ca nasal cavity 3 21.42% 2 4 Ca nasopharynx 2 14.28% 1 Malignant melanoma 1 7.14% 0 Sl.
It is usually asymptomatic, achieving a large size and exhibiting aggressive behavior, and is often diagnosed as 'juvenile ossifying fibroma
', 'aggressive ossifying fibroma
' or 'active ossifying fibroma
' in the literature.
Aggressive psammomatoid ossifying fibromas
(APOFs) represent a subgroup of related fibro-osseous lesions that appears to be unique to the nasal cavity, paranasal sinuses, and orbit.
(3) The most common types of fibro-osseous lesions are fibrous dysplasias and ossifying fibromas
, which have similar histologic characteristics.
In our case we treated ossifying fibroma
with wide resection (12).
Psammomatoid (juvenile) ossifying fibroma
of the orbit.
(2) Histologically, an ossifying fibroma
is a densely cellular, well-defined fibrous tumor that begins ossifying at the periphery.
Included in the group of benign fibro-osseous lesions are fibrous dysplasias and ossifying fibromas
. Although these two lesions are considered to be separate entities, they may not be distinguishable on histopathologic evaluation.
The first histopathological specimen revealed increase in mitotic activity, presence of osteoblastic chain surrounding bone trabecules, which lead us to suspect the lesion as being ossifying fibroma
. It also lead us to perform second incisional biopsy.