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Adamantinoma of the long bones, or extragnathic adamantinoma, is an extremely rare, slow growing, low-grade malignant tumor of epithelial origin, that occurs almost exclusively in the tibia and the fibula.
The tumor usually occurs in the second to fifth decade of life.
The patient usually has swelling that may be painful. The duration of symptoms can vary from a few weeks to years.Adamantinoma appears as an eccentric, well-circumscribed, and lytic lesion on plain x-ray.
Adamantinoma is treated by wide surgical excision

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Adamantinoma es

Adamantinoma de huesos largos es un tumor maligno sumamente raro de origen epitelial, bajo grado y crecimiento lento que se localiza casi exclusivamente en la tiba y fibula. Este tumor surge usualmente entre la segunda y quinta década de vida y el paciente suele sufrir hinchazones dolorosas. La duración de los síntomas puede variar de semanas a años. En radiografías simples, el adamantinoma aparece como una lesión lítica, excéntrica y propiamente circunscrita. El tratamiento conlleva excisión quirúrgica de tipo amplio.

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Aneurysmal Bone Cyst

Aneurysmal bone cyst (ABC) is a solitary, expansile and erosive lesion of bone. The cause of this non-neoplastic lesion is unknown.
Most patients are under 20, but the tumor can occur at any age.
The tumor presents with pain for several weeks with local swelling. Any bone may be involved, but the most common sites include the long bones and the posterior parts of the spinal vertebra.On xrays, the lesion has a destructive, lytic, and expansile appearance.
Most ABC's are sucessfully treated with curettage and packing with bone chips or bone cement.

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Benign Fibrous Histiocytoma

This tumor has been given the names benign fibrous hystiocytoma, fibrous histiocytoma, xanthofibroma, fibroxanthoma of bone, and primary xanthoma of bone. The author of this site prefes the name benign fibrous histiocytoma.
There is no defined age group for this tumor except that patients are generally older than those found with a non-ossifying fibroma.
Clinically, patients report pain from the lesion, often of months or years duration. Pain may be associated with pathological fracture. There may be some local tenderness, but no swelling or mass is seen, and there are no systemic symptoms. There is normally no impairment of the function of the nearby joint. Spinal lesions may cause neurologic defect by pressing on the spinal cord.It has a lytic, loculated appearance with prominent sclerosis of the edges of the lesion.
Treatment consists of careful and complete curettage and filling of the defect with graft material, bone cement, or other suitable bone void filler.

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