By Li G.
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Spontaneous abortion Spontaneous abortion is defined as pregnancy terminating before the 20th completed week of gestation. Approximately 80% of spontaneous abortions occur in the first trimester. The causes of spontaneous abortions fall into two categories: genetic and environmental (maternal) as listed next: Fig. 5. TVUS of the uterus shows a normal embryo and separate amniotic membrane (arrow) in close relation to the embryo. This should not be mistaken for nuchal translucency. Levi et al  suggested a 4-mm CRL cutoff because their study demonstrated cardiac activity in all embryos with a CRL of 4 mm .
Anderson DR, Wells PS, Stiell I, MacLeod B, Simms M, Gray L, et al. Use of a clinical diagnosis model to safely avoid the need for urgent radiological investigation. Arch Intern Med 1999;159:477 – 82. Wells PS, Anderson DR, Bormanis J, et al. Value of assessment of pretest probability of deep-vein thrombosis in clinical management. Lancet 1997;350: 1795 – 8. Kearon C. Diagnosis of pulmonary embolism. CMAJ 2003;168:183 – 94. Wells PS, Anderson DR, Rodger M, Forgie M, Kearon C, Kovacs G, et al. Evaluation of D-dimer in the diagnosis of suspected deep-vein thrombosis.
R. Anderson / Radiol Clin N Am 42 (2004) 279–296 This is to detect patients whose calf DVT may have extended to the proximal venous system, which has thereby increased the risk of PE. ography, particularly if the clinical pretest probability is high. Diagnosis of deep venous thrombosis of the upper extremities Other considerations Unfortunately, validated diagnostic algorithms are not available for patients presenting with DVT of the upper extremity. There also are no models to assist clinicians in determining pretest probability.