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Contrast Intra-venous

Biopsy specimens of PAH include constrictive lesions and complex lesions. Constrictive lesions comprise medial hypertrophy and intimal thickening. Medial hypertrophy is defined as the increase in both number and cross-sectional area of the SM cells lining the walls of the pre- and intra-acinar pulmonary arteries intimal thickening implies an increased number of fibroblasts in the thin layer between a SM cell and lamina propria of the blood vessel. These changes can be seen in both IPAH and pulmonary venous hypertension. In contrast, complex lesions are considered pathognomonic for PAH. The complex or plexiform lesion consists of focal proliferation of endothelial channels consisting of fibroblasts, SM cells, and connective tissue matrix. These lesions disrupt vascular vessel wall and serve as a nidus for in situ thrombosis. [Pg.154]

Rhabdomyosarcoma is the most common soft tissue tumor of the orbit in children under the age of 15 years. Clinically, rhabdomyosarcoma of the orbit is characterized by rapidly progressive proptosis, a decrease of ocular motility, and unilateral ptosis. Cross-sectional imaging reveals a well-delineating tumor whose density or signal intensity is similar to intra-orbital muscles on unenhanced images and increases markedly after intravenous contrast administration. The differential diagnosis includes venous lymphatic malformation, lymphoma, intra-orbital neuroblastoma, and idiopathic inflammatory disease of the orbit (Mueller-Forell and Pitz 2004). [Pg.157]


See other pages where Contrast Intra-venous is mentioned: [Pg.106]    [Pg.353]    [Pg.171]    [Pg.494]    [Pg.154]    [Pg.513]    [Pg.237]   
See also in sourсe #XX -- [ Pg.16 , Pg.18 , Pg.20 , Pg.38 , Pg.59 , Pg.69 , Pg.77 , Pg.167 , Pg.185 ]




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Venous contrast

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