Overview of peripheral arteriovenous malformations: From diagnosis to treatment methods

Multimodal Ultrasound Diagnosis of Congenital Renal Arteriovenous Malformation: A Case Report

Traditionally, computed tomography angiography has been considered the gold standard for diagnosing renal arteriovenous malformation (AVM). Despite the sensitivity of ultrasound in detecting AVM through Doppler techniques, it often lacks the ability to provide detailed insights into the lesion. In this narrative, we present a case of unexplained hematuria accompanied by flank pain, which was conclusively diagnosed as congenital renal AVM via multimodal ultrasound. The pivotal contributions of color Doppler ultrasound and contrast-enhanced ultrasound are that they are instrumental in enabling an early and markedly precise diagnostic pathway.

Coil-assisted ethanol embolization of traumatic arteriovenous fistulas: a 10-year retrospective study

Purpose

This study aimed to evaluate the efficacy and safety of ethanol embolization in treating traumatic arteriovenous fistulas (TAVFs).

Materials and methods

From March 2012 to April 2020, 42 consecutive patients (29.9 ± 15.1 years, range: 3-68 years) with peripheral TAVFs underwent ethanol embolization. All patients underwent clinical and imaging follow-ups (40.0 ± 25.9 months, range: 3-90 months). The mean time to onset of symptoms after trauma was 5.4 ± 5.9 months (range: 0.5-30 months). Among the patients, 27 (64.3%) reported that the TAVFs occurred after blunt trauma, 10 (23.8%) presented after penetrating trauma (with 4 patients involving penetration by infusion indwelling needles), and 3 (7.1%) had a history of surgery. Treatment effects, devascularization rates, and complications were evaluated at follow-ups conducted at 1-3 month intervals.

Results

Seventy-one embolization procedures were performed, with a mean of 1.6 ± 0.7 procedures per patient. Thirty-four patients received coil-assisted ethanol embolization. Absolute ethanol was used in all procedures, with an average volume of 7.1 ± 4.2 ml per procedure (range: 1-18 ml); 28 patients (28/42, 66.7%) received coil embolization in 36 procedures (36/71, 50.7%). Upon re-examination, 39 patients (92.9%) achieved 100% devascularization; of these, 29 patients (74.4%) with Schobinger stage II TAVFs improved to stage I or became asymptomatic. Overall, 30 cases (66.7%) achieved a complete response, while the other 12 cases (33.3%) showed a partial response. In addition, no major complications were observed postoperatively, apart from minor complications.

Conclusions

Coil-assisted ethanol embolization can effectively manage TAVFs with an acceptable risk of mild complications.

A rare case of Bannayan-Riley-Ruvalcaba syndrome with concurrent arteriovenous malformation

Bannayan-Riley-Ruvalcaba syndrome (BRRS) is a congenital, autosomal-dominant disorder characterized by a triad of macrocephaly, lipomatosis, and pigmentation of the glans penis. The symptoms of this rare syndrome vary greatly and include multiple hamartomatous polyps, macrocephaly, increased birth weight, developmental delay, and intellectual disability. Vascular abnormalities, including arteriovenous malformations (AVMs), have rarely been reported as part of the vascular manifestations associated with BRRS. Congenital AVMs can rarely progress, resulting in limb- or life-threatening complications. We present the case of a young man with BRRS diagnosed in childhood and presenting with three AVMs involving the right upper extremity and chest. We also provide a brief literature summary of reported cases of BRRS with AVMs. Our paper highlights the importance of recognizing and understanding the vascular manifestations in patients with BRRS. Knowledge of the association between BRRS and AVMs is crucial for guiding patient diagnosis and management, optimizing treatment strategies, and improving overall patient outcomes.