A 71-year-old male appeared at the facility complaining of disturbance of consciousness and bilateral papilledema. The laboratory test revealed anemia and coagulation abnormality. A physical examination and magnetic resonance imaging (MRI) of the brain with and without gadolinium showed no abnormalities. A lumbar puncture showed a high pressure, but a normal cerebrospinal fluid (CSF) cell count. Cerebral angiography showed no morphological abnormalities, but it revealed an asymmetric right dominant type of confluence of the sinuses with the partially-communicating left transverse sinus in the late phase. Furthermore, there was a delay in the cerebral circulation time (CCT). Subsequently, venography and ultrasonography revealed right internal jugular vein thrombosis associated with lung cancer. The patient recovered from the disturbance of consciousness immediately after an emergency ventriculoperitoneal shunt and anticoagulation therapy. This case was diagnosed as secondary pseudotumor cerebri (PTC). In order to facilitate the early detection of secondary PTC, it is important to take note of symptoms of intracranial hypertension with no remarkable intracranial lesions and to consider the possibility of PTC, especially in the patients with high risk factors for coagulopathy including lung cancer. Keywords: Cerebral circulation time, Confluence of sinuses (torcular Herophili), Idiopathic intracranial hypertension, Jugular vein thrombosis, Lung cancer, Pseudotumor cerebri
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