OSTEOMA Figure 4-17 OSTEOMA Top: Dense cortical-like bone of osteoma adjacent to underlying cortex and attached to cancellous bone. Bottom: Mixed cortical and trabecular osteoma of long bone containing abundant cancellous bone. More

OSTEOMA Figure 4-18 OSTEOMA A: Osteoma consists of compact bone with haversian systems of varying size. B: The bone is predominately lamellar and focally woven in architecture. C: Mixed cortical and trabecular osteoma covered by periosteum. D: Trabeculae are rimmed by osteoblasts and surrounde... More

OSTEOMA Figure 4-13 OSTEOMA A: Frontal radiograph of the femur shows an oval radiodense mass on the surface of the femoral diaphysis with a smooth contour. B: Radiograph of cancellous osteoma arising from the parietal bone. C: Axial CT image shows an osteoma with a trabecular component anchored... More

OSTEOMA Figure 4-10 OSTEOMA Osteoma of frontal bone produces a visible protuberance. More

OSTEOMA Figure 4-11 OSTEOMA Left: Axial CT shows large, oval, smooth-surfaced osteoma of skull. The tumor is homogeneously radiodense. Right: Axial CT image shows radio dense tumor filling the frontal sinus and causing mass effect onto the brain. More

OSTEOMA Figure 4-15 OSTEOMA Smooth convex surface of osteoma from the orbit. More

OSTEOMA Figure 4-16 OSTEOMA Osteoma of long bone is elongated and has a bosselated smooth surface. More

OSTEOID OSTEOMA Figure 4-24 OSTEOID OSTEOMA Top: Serial cross section of osteoid osteoma located in the cortex of the tibia. The tumor is round and red, with a white-tan center. The normal cortex is apparent (white arrows) and is surrounded by a thick layer of periosteal bone. Bottom: Resected t... More

OSTEOID OSTEOMA Figure 4-29 OSTEOID OSTEOMA Infrequently, osteoid osteoma has cartilage as a portion of the matrix. More

OSTEOMA Figure 4-14 OSTEOMA Top: Axial CT image shows the mixed cortical and trabecular pattern, attached to the inner surface of calvarium. Bottom: Cross section through osteoma with outer cortical and inner trabecular areas. More

OSTEOID OSTEOMA Figure 4-20 OSTEOID OSTEOMA Left: Frontal radiograph of the spine showing levoconvex scoliosis caused by muscle spasm induced by painful osteoid osteoma. Above: Reformatted sagittal CT image shows a well-defined, round sclerotic lesion in the pedicle and lamina (arrow). More

OSTEOID OSTEOMA Figure 4-25 OSTEOID OSTEOMA Oval tumor is demarcated from surrounding cortex. More

OSTEOID OSTEOMA Figure 4-30 OSTEOID OSTEOMA Scattered tumor cells have positive nuclear staining for FOS. More

OSTEOID OSTEOMA Figure 4-28 OSTEOID OSTEOMA Numerous capillaries fill the intertrabecular space and supply nutrients to the tumor cells. More

OSTEOID OSTEOMA Figure 4-26 OSTEOID OSTEOMA Left: The tumor is characterized by randomly oriented interconnecting trabeculae of woven bone. Right: Sometimes the neoplastic bone is sheet-like in architecture. More

OSTEOMA Figure 4-12 OSTEOMA A: Solid mass of cortical bone on the surface of a rib. B: Accompanying axial CT image displays the homogeneous radiodensity of the tumor. C: The tumor is composed of an aggregate of cortical-like bone. More

OSTEOID OSTEOMA Figure 4-22 OSTEOID OSTEOMA Left: Radiograph of the femur demonstrates a well-defined oval radiolucent lesion with surrounding sclerotic bone. Right: Reformatted coronal CT image shows that the lesion is juxtacortical and surrounded by abundant well-formed reactive bone. More

OSTEOID OSTEOMA Figure 4-21 OSTEOID OSTEOMA Left: Frontal radiograph of the leg shows an oval, lytic, sharply demarcated, metadiaphyseal subperiosteal tumor in a child (arrows). The tumor is surrounded by well-formed homogeneous subperiosteal reactive bone (arrowheads). Above: Axial CT image sho... More

OSTEOID OSTEOMA Figure 4-23 OSTEOID OSTEOMA A: CT tomogram of the femur demonstrates a dense convex periosteal reaction on the lateral femoral diaphysis with a subtle central lucency (arrow). B: Coronal STIR MRI shows bone marrow edema. C: Axial CT image demonstrates well-defined round intracor... More