The focal hepatic hot spot sign is a CT sign that appears as an intense enhancement of the quadrate lobe in the arterial phase. We present this imaging finding in a case of behcet disease causing superior vena cava syndrome and discuss the physiological cause and importance of this sign.

Carotid-cavernous fistulas (CCF) are defined as abnormal vascular communication between the internal and external carotid arteries or their meningeal branches and the cavernous cavity. The objective of our work is to show the radiological signs allowing the diagnosis of a carotid-cavernous fistula. We report the case of a 40-year-old patient with a left carotid-cavernous fistula following a head trauma, who consulted the emergency room 3 days after his trauma because of persistent pulsatile headaches and the appearance of a left exophthalmos. A CT scan, a Doppler ultrasound followed by a cerebral MRI after injection of contrast medium were performed. An angio-MRI confirmed the diagnosis and showed the presence of a left carotid-cavernous fistula. The mode of revelation of post-traumatic CFC is often stereotyped and the association of intracranial murmur and pulsatile exophthalmos immediately evokes the diagnosis. Cross-sectional brain imaging allows the diagnosis to be made. Arteriography remains irreplaceable to confirm the existence of the breach and to analyze all the angiographic elements that will be important at the time of the final therapeutic decision. The diagnosis of carotid-cavernous fistula suspected clinically is confirmed on imaging in the presence of evocative signs.