MRI dural tail sign may help separate canine meningioma from glioma: full analysis

A retrospective MRI study published in May 2026 adds fresh evidence that the dural tail sign may be a stronger discriminator between canine meningioma and glioma than many clinicians have treated it to be. In 27 dogs with histopathologically confirmed tumors, investigators reported high sensitivity and specificity for DTS in separating meningioma from peripherally located glioma, along with substantial agreement between readers and almost perfect agreement within readers. The work appears in Veterinary Radiology & Ultrasound and comes from a multi-institution team led by researchers at Texas A&M University. (pubmed.ncbi.nlm.nih.gov)

That matters because the dural tail sign has long occupied an awkward place in veterinary neuroimaging. It’s classically associated with meningioma and extra-axial disease, but it has never been considered pathognomonic. Prior reviews of canine intracranial tumors note that meningiomas often show a broad-based meningeal attachment, strong contrast enhancement, and sometimes a dural tail sign, while also cautioning that the feature is not specific to meningioma or even to neoplasia in general. Case reports have also documented glioma-associated lesions with an apparent dural tail sign, reinforcing that radiologists still need to interpret the finding in context. (frontiersin.org)

In the new paper, the authors evaluated dogs that underwent 3T brain MRI at Texas A&M between 2011 and 2021 and had a confirmed histopathologic diagnosis of meningioma or glioma. The study focused specifically on differentiating meningioma from peripherally located glioma, an important distinction because peripheral gliomas can mimic extra-axial masses on imaging. According to the abstract and article record, the dural tail sign achieved 95% sensitivity and 89.1% specificity, with substantial interobserver agreement and almost perfect intraobserver agreement. (pmc.ncbi.nlm.nih.gov)

The broader literature helps explain why that’s notable. Reviews of canine primary intracranial cancer describe meningioma as the most common extra-axial meningeal tumor in dogs and note that MRI sensitivity for correctly identifying intracranial meningiomas has ranged widely, from 60% to 100%, depending on the study and context. At the same time, imaging overlap with other tumors remains a recurring problem, including overlap with gliomas in some cases and with other masses such as histiocytic sarcoma or granular cell tumors. (frontiersin.org)

I didn’t find a separate institutional press release or formal outside expert commentary tied specifically to this paper. Still, the surrounding evidence base supports a measured interpretation: DTS appears useful, but not definitive. Human and veterinary literature alike have emphasized that the sign can reflect reactive dural change rather than direct tumor extension, and veterinary reports have documented exceptions. So the practical takeaway is not that DTS settles the diagnosis, but that in the narrower meningioma-versus-peripheral-glioma question, it may be more dependable than earlier conventional wisdom suggested. (pmc.ncbi.nlm.nih.gov)

Why it matters: For veterinary professionals, especially radiologists, neurologists, oncologists, and surgeons, better confidence in MRI-based pattern recognition can improve decisions before tissue diagnosis is available. A more reliable imaging clue could sharpen presumptive diagnosis, inform whether a lesion is discussed as potentially surgical versus more likely managed with radiation or other modalities, and help frame prognosis and options for pet parents earlier in the workup. That said, the study was retrospective and small, and its reported performance should be interpreted within that design. It’s best viewed as support for integrating DTS into a multimodal MRI assessment, not replacing histopathology or broader clinical judgment. (pubmed.ncbi.nlm.nih.gov)

What to watch: The key question now is external validation. If multicenter studies reproduce these findings in larger cohorts, with different scanners and readers and with more tumor mimics included, DTS could become a more prominent part of routine reporting language and pre-treatment decision-making for canine brain tumors. (pubmed.ncbi.nlm.nih.gov)