By A.M.A. de Schepper
Magnetic resonance imaging has already turn into a Most worthy imaging modality within the diagnostic work-up of musculoskeletal neoplasms. whereas excessive accuracy of MRI for staging reasons has been confirmed, we'll concentration during this monograph at the characterization of basic bone and delicate tissue tumors by means of MRI. the main objective of this monograph is to supply an atlas of magnetic resonance beneficial properties of fundamental bone and smooth tissue tumors for radiologists, orthopedic surgeons and physiotherapists. the consequences provided are in line with investigations of ninety four fundamental bone and smooth tissue tumors and mimicking stipulations by way of magnetic resonance imaging. even though the size of the cloth permits statistical dealing with, the variety of sufferers according to subgroup is just too small to return to convinced conclusions. we are going to as a result restrict ourselves to the outline of and reviews on lots of situations to demonstrate the diagnostic strength of this new imaging modality. we wish to thank the nameless cooperators: referring clinicians, pathologists, nurses, technicians and secretaries whose aid enabled us to give this monograph. we might additionally prefer to exhibit our gratitude to the corporations Siemens AG and Schering AG for technical support.
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Additional resources for Magnetic Resonance Imaging of Bone and Soft Tissue Tumors and Their Mimics: A Clinical Atlas
Since symptomatic vertebral hemangiomas need an appropriate treatment, MRI also has a therapy-planning value. MR-grey scale of vertebral henangiona T1 LEGEND : • • • 8 7 6 5 3 + I I II • ASYMPtoMatic type D COMPressive type Gd-DTPA D 2 2 3 II 5 6 7 8 T2 46 Fig. 1. D. 42 year-old female. a and b. CR of the thoracic spine, antero-posterior (a) and lateral (b) position. Honeycomb-appearance of the vertebral body and pedicles of TH XI. Preserved vertebral height and intact posterior vertebral wall.
MRI of the knee, coronal section, proton density-(d) and T2-WI (e). Again the mass is homogeneous and sharply demarcated by a low SI-rim . The exact localization, the full extent and the relationship to the adjacent normal knee joint are clearly demonstrated on these coronal sections . Uniform and intermediate to high SI (5) of the lesion. f. Van Strijthem, Antwerp). Numerous giant cells (long arrows) . Abnormal mitotic figures (short arrows). Diagnosis : Giant cell tumor, borderline type. 44 CHAPTER 7 HEMANGIOMA Hemangiomas are benign hamartomas most commonly found in the calvarium and the vertebral bodies.
Blood flow contributes little to the T 1-SI at the pulse sequences used because of different 51 of the osseous and the extra-osseous tumor component which have the same vascularization pattern. The exact cause of the increased 51 on T2-WI may be tumor hypercellularity but remains a matter of speculation. In a personal communication Laredo distincts an inverted relation between the amount of fat tissue and the amount of angiomatous tissue in vertebral hemangiomas (2). If a vertebral hemangioma has a high 51 on T1-WI one can predict the presence of a poorly vascularized lesion on angiography and the hemangioma is mostly asymptomatic.