経静脈的に造影剤を投与されていない単純CTである．図１７〜図２１で右鼠径部の皮下に浮腫がある（↑）．図３〜図８で部分的だが下大静脈が高吸収値を示し（▲），新鮮な血栓を強く示唆する．それより尾側は，周囲に脂肪組織の濃度上昇を伴う腫大した総腸骨静脈と大腿静脈を描出しており（△），血栓性静脈炎である．造影CTを撮れば内腔が造影されない静脈を認め診断はより容易になる．

文献考察：深部血栓性静脈炎．表１は臨床的特徴，2点以上は血栓性静脈炎の可能性が高い．図１は診断のalgorithm．
BMJ. 2003 May 31;326(7400):1180-4.
Diagnosis, investigation, and management of deep vein thrombosis.
Tovey C, Wyatt S.　

Deep-vein thrombosis (DVT) is a common condition that can lead to complications such as postphlebitic syndrome, pulmonary embolism and death. The approach to the diagnosis of DVT has evolved over the years. Currently an algorithm strategy combining pretest probability, D-dimer testing and compression ultrasound imaging allows for safe and convenient investigation of suspected lower-extremity thrombosis. Patients with low pretest probability and a negative D-dimer test result can have proximal DVT excluded without the need for diagnostic imaging. The mainstay of treatment of DVT is anticoagulation therapy, whereas interventions such as thrombolysis and placement of inferior vena cava filters are reserved for special situations. The use of low-molecular-weight heparin allows for outpatient management of most patients with DVT. The duration of anticoagulation therapy depends on whether the primary event was idiopathic or secondary to a transient risk factor. More research is required to optimally define the factors that predict an increased risk of recurrent DVT to determine which patients can benefit from extended anticoagulant therapy.PMID: 12775619 （full text）