Related Experiment Video
Updated: Aug 17, 2026
Longitudinal In Vivo Imaging of the Cerebrovasculature: Relevance to CNS Diseases
Published on: December 6, 2016
Slow-flow vascular malformations of the pons: capillary telangiectasias?
R M Barr1, W P Dillon, C B Wilson
1Department of Radiology, University of California San Francisco, USA.
Purpose:
To report clinical and MR features that suggest telangiectatic vascular malformations of the pons:
Methods:
The MR scans and clinical data of 12 patients demonstrating an enhancing pontine lesion with minimal or no signal abnormality on T2-weighted images were reviewed. None of the patients underwent angiography or biopsy. Follow-up scans, available for all patients between 3 weeks and 40 months (range, 11.5 months), were reviewed.
Results:
The patients presented with a variety of symptoms including headache (n = 4), vertigo (n = 3), gait abnormality (n = 3), and hearing loss (n = 2). Two were referred for biopsy or treatment of presumed pontine glioma. On precontrast MR, 3 of 12 lesions were isointense on both T1- and T2-weighted images. Three of 12 lesions were slightly hypointense on T1-weighted images and 8 of 12 were slightly hyperintense on T2-weighted images. Postgadolinium images showed a discrete focus of enhancement with irregular or brushlike borders. Eight of 12 had an anomalous draining vessel from the lesion to the surface of the pons. None demonstrated mass effect or hemorrhage. Gradient-echo sequences in 7 patients all showed marked T2 shortening, despite the absence of hemorrhage on either T1- or T2-weighted images. None of the follow-up scans showed radiographic or clinical progression.
Conclusion:
The benign clinical course, lack of mass effect, and minimal or no T2 prolongation argue against neoplasm and instead indicate a vascular cause. We suspect the decreased signal on gradient-echo sequences represents elevated intravascular deoxyhemoglobin from stagnant blood flow. The findings are atypical for cavernous angioma or classic venous malformation. Although pathologic confirmation is lacking, the radiographic features are most consistent with capillary telangiectasia or a transitional capillary-venous malformation. Despite the absence of progression or hemorrhage in any of the patients to date, the long-term prognosis currently is unknown. We emphasize the importance of recognizing the nonneoplastic nature of these lesions.
Insights
Telangiectatic vascular malformations in the pons present with specific MR features, including enhancement and minimal T2 signal changes. Recognizing these nonneoplastic vascular lesions is crucial for accurate diagnosis and management.
Area of Science:
- Neuroradiology
- Vascular Malformations
- Neuro-oncology
Background:
- Pontine lesions can be challenging to diagnose, with potential for misinterpretation as neoplasms.
- Distinguishing benign vascular malformations from tumors is critical for appropriate patient management.
Purpose of the Study:
- To identify and report the characteristic clinical and magnetic resonance (MR) imaging features of telangiectatic vascular malformations in the pons.
- To differentiate these vascular lesions from pontine gliomas.
Main Methods:
- Retrospective review of MR scans and clinical data from 12 patients with enhancing pontine lesions and minimal T2 signal abnormality.
- Analysis of precontrast, postgadolinium, and gradient-echo sequences.
- Review of follow-up scans (3 weeks to 40 months).
Main Results:
- Patients presented with varied neurological symptoms (headache, vertigo, gait abnormality, hearing loss).
- MR imaging revealed discrete enhancement with irregular borders, and in 8/12 patients, an anomalous draining vessel.
- Gradient-echo sequences showed T2 shortening, and no lesions demonstrated mass effect, hemorrhage, or progression on follow-up.
Conclusions:
- The benign clinical course, lack of mass effect, and minimal T2 prolongation suggest a vascular etiology rather than neoplasm.
- Findings are atypical for cavernous angioma or classic venous malformation, most consistent with capillary telangiectasia or a transitional capillary-venous malformation.
- Recognition of these nonneoplastic vascular lesions is important despite the lack of pathological confirmation and unknown long-term prognosis.
Related Concept Videos
01:10Mechanism of Angiogenesis
01:24Regulation of Angiogenesis and Blood Supply
01:17Autoregulation of Blood Flow
Chemical Signaling in Autoregulation
Chemical signaling operates at the precapillary sphincter level, inciting either contraction or relaxation.
01:26Arteries of the Head and Neck
The internal carotid arteries supply blood to the anterior portion of the cerebrum. They enter the...
01:26Transient Ischemic Attack l: Introduction
01:22Portal Hypertension