Langerhans Cell Histiocytosis
Langerhans Cell Histiocytosis Updated by Mark Edson BACKGROUND What is the estimated annual incidence of Langerhans cell histiocytosis (LCH) in the U.S.? ~1,200 cases/yr of LCH in the U.S. It…
Rhabdomyosarcoma Updated by Vinita Takiar
Rhabdomyosarcoma Updated by Vinita Takiar BACKGROUND What are the 3 most commonly tested rhabdomyosarcoma (RMS) cases on the radiation oncology oral boards? Bladder (trigone), parameningeal (PM), and orbit What are…
Ewing Sarcoma
Ewing Sarcoma Updated by Randa Tao WORKUP/STAGING What is the annual incidence of Ewing sarcoma (EWS) in the U.S.? How common is it relative to other bone tumors? 200 cases/yr…
Protection and Quality Assurance in Bone Densitometry
(1) where, D(z) is the radiation dose profile along the axis of rotation, N the number of data channels used in a particular axial acquisition, and T is the slice…
of Insufficiency Fractures
Fig. 1 Anteroposterior radiograph of the pelvis demonstrates areas of sclerosis in both sacral ala (arrows) consistent with insufficiency fractures Fig. 2 Axial MRI (STIR-sequence) of the pelvis demonstrating bone marrow edema…
and Malignant Vertebral Fractures
Fig. 1 Conventional lateral thoracic spine radiographs demonstrating vertebral fractures. a Osteoporotic fractures at the mid thoracic spine with slight anterior wedging of the vertebral bodies (arrows). b Mild anterior wedging…
in Osteoporosis
Fig. 1 Bony cortical changes with age. a Frontal hand radiograph of a 18-year-old woman shows normal cortical thickness in all the bones. b Frontal hand radiograph of a 40-year-old woman…
and Peripheral QCT
Fig. 1 BMD calibration phantoms. a Shows the solid-state Mindways (short arrow) and Image Analysis (long arrow), phantoms which are based on the original “Cann-Genant” phantom. b Depicts the two element…
Marrow Changes in Osteoporosis
Fig. 1 From birth, red marrow converts to fatty marrow from the periphery to the central skeleton. Superimposed on this centripedal pattern, red marrow converts to fatty marrow in the tubular…
of Vertebral Fractures
Age (years) Chinese a, f (%) Japanese b, g (%) Latin American c, g (%) European d, g (%) American (white) e, g (%) 50 ~ 59 2.7 6.9 6.3 60 ~ 69 10.8…
