Case Of Low-grade Osteosarcoma Research Articles

A Case of Low Grade Osteosarcoma Developing in the Middle Skull Base after Radiotherapy of Adenoid Cystic Carcinoma in the Posterior Nasal Cavity

A Case of Low Grade Osteosarcoma Developing in the Middle Skull Base after Radiotherapy of Adenoid Cystic Carcinoma in the Posterior Nasal Cavity

Low-Grade Central Osteosarcoma of the Rib: A Case Report and Brief Review of the Literature

Low-grade central osteosarcoma is a rare variant of osteosarcoma which comprises less than 1-2% of all osteosarcomas. Most low-grade osteosarcomas involve long bones, most commonly distal femur, and proximal tibia. Histologically this tumor is difficult to diagnose, and an unusual location makes this diagnosis even more challenging. Here we report a case of low-grade osteosarcoma presenting as a chest wall mass involving the left 6th–8th ribs. This unusual site of presentation significantly added to the diagnostic difficulties of this rare tumor with challenging histologic features. To the best of our knowledge, only six cases of low-grade central osteosarcoma of the ribs have been reported in the English literature.

Quiste óseo aneurismático coexistente con osteosarcoma. Discusión radiopatológica

Aneurysmatic bone cysts are benign lesions of unknown origin. It has been postulated that they might occur in reaction to trauma or to a primary benign (giant cell tumor, chondroblastoma, etc.) or malignant (osteosarcoma) bone tumor that results in local hemodynamic changes. Their malignant transformation is controversial. We present a case of low grade osteosarcoma with a radiologic progression that was indistinguishable from that of an aneurysmatic bone cyst.