Parosteal osteosarcoma
Updates to Case Attributes
Parosteal osteosarcoma is typically visualised as a bulky exophytic osseous mass arising from the outer periosteum. The common location is usually the posterior aspect of the distal tibia metaphysis. The The string sign is commonly seen in Parostealthe parosteal type which describes a lucent line between the bulky exophytic tumor and the adjacent cortex. The prognosis is usually good.
-<p>Parosteal osteosarcoma is bulky exophytic osseous mass arising from the outer periosteum. The common location is usually the posterior aspect of the distal tibia metaphysis. The string sign is commonly seen in Parosteal type which describes a lucent line between the bulky exophytic tumor and the adjacent cortex. The prognosis is usually good.</p>- +<p>Parosteal osteosarcoma is typically visualised as a bulky exophytic osseous mass arising from the outer periosteum. The common location is usually the posterior aspect of the distal tibia metaphysis. The string sign is commonly seen in the parosteal type which describes a lucent line between the bulky exophytic tumor and the adjacent cortex. The prognosis is usually good.</p>
Updates to Study Attributes
Exophytic and cauliflower-like mass with dense osteoid matrix arising from the posterior lateral aspect of the distal femoral metaphysis. On the lateral view, a thin lucent line is noted separating the bulky mass from the adjacent cortex. The radiographic findings are highly suggestive of juxtacortical osteosarcoma; Parostealparosteal type. No pathological fracture seen.
Updates to Study Attributes
The CT study demonstrates the morphology of the tumor and the epicenter of the mass at the posterolateral distal femoral metaphysis with no invasion to the bone medulla. There are areas of low attenuation seen peripherally within the mass which may representsrepresent chondroid tissue.
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