dural tail sign
Definition A finding by contrast-enhanced MRI of the brain that was once regarded as specific for meningionas, in which a thickened and signal-enhanced dura mater is in continuity with the brain mass, appearing as a “tail” arising from the mass (here, the image has a tails at 6 o’clock and 12 o’clock).
Criteria, dural tail sign:
• The tail should be seen on two successive slices of the tumour
• It should taper away from the tumour,
• Must enhance more than the tumour.
Differential diagnosis Once regarded as highly specific for meningiomas, it is seen in only 60% of meningiomas. It has also been described in nonmeningiomatous lesions–e.g., chloromas, primary CNS lymphomas, sarcoidosis, schwannomas, metastases, and syphilitic gummata.
Pathogenesis Uncertain; reactive change or actual tumour invasion.
Reference Indian J Radiol Imaging. 2009 May; 19(2): 135–145.