Background: Venous malformations (VMs) are congenital vascular abnormalities characterized by tortuosity, slow blood flow, and gradual growth. Intra-articular venous malformations (IAVMs) of the knee are rare and often present with symptoms similar to juvenile idiopathic arthritis (JIA) or late sequelae of trauma. VM in children is commonly misdiagnosed as hemangioma. This study aims to analyze the clinical and MRI features of IAVM in the knee joint. Methods: This retrospective study analyzed patients from a reference unit for the treatment of vascular malformations in the Pediatric Surgery Department. The group was collected starting from the year 2014 until the 100th patient was identified in the year 2018, all with MRI-confirmed VM based on a predefined protocol. From this group, 19 patients with lower limb symptoms were identified, and 9 patients with VM involving the knee joint were selected for further analysis. Results: The most common symptoms in IAVM patients were pain and swelling, chronic in five (55%) and intermittent in four (45%). Four (45%) reported worsening pain during or after physical activity. A history of intra-articular bleeding was noted in five (55%), leading to mild knee contracture (10° reduction in extension) and decreased mobility. Limb deformities were observed in eight (89%). Diffuse VMs, affecting both intra- and extra-articular tissues, were present in eight (89%), involving the thigh in seven (78%), crus in five (56%), gluteal muscles in three (33%), and foot tissues in one (11%). The suprapatellar recess and Hoffa’s fat pad were involved in all patients (100%). Conclusions: IAVMs are rare causes of knee dysfunction in children and young adults, particularly in cases of unexplained pain, swelling, or instability. They should be considered in the differential diagnosis of hemophilic arthropathy, JIA, or late post-traumatic sequelae. Untreated IAVMs can lead to intra-articular bleeding, cartilage degeneration, and disability. Early diagnosis via MRI and ultrasound is crucial to identifying IAVMs and preventing joint degeneration. Timely treatment helps avoid further damage and long-term disability.

A differentiation between hepatocellular carcinoma (HCC) and benign liver lesions is required. The aim of the study was to perform an analysis of the time of enhancement of focal liver lesions in a contrast-enhanced ultrasound (CEUS) examination. The curves of enhancement and the homogeneity of the tumor enhancement were assessed. The study included 52 patients with diagnoses of hepatocellular adenoma (18), focal nodular hyperplasia (11) and HCC (28). The study included magnetic resonance imaging or computed tomography and a comparison of the obtained information with CEUS. In the benign lesions groups after 20–30 s, the enhancement was similar to the liver parenchyma. In the HCC group, the enhancement was slightly less intense compared to the liver parenchyma and the benign lesions. The difference of the enhancement in the arterial phase (benign lesions vs. HCC) was p = 0.0452, and the difference of enhancement in the late venous phase (benign lesions vs. HCC) was p = 0.000003. The homogeneity of the enhancement (benign lesions vs. HCC), respectively, was p = 0.001 in the arterial phase, p = 0.0003 in the portal venous phase and p = 0.00000007 in the late venous phase. Liver tumors can be classified as benign when they are homogenous in the arterial phase and don’t present washout. HCC in the arterial phase is inhomogeneous and washout is observed in the venous phases. When radiological symptoms suggest malignant lesion, CEUS can be used to select the best biopsy access.

Haemoptysis is an alarming symptom of a wide spectrum of underlying diseases, ranging from indolent chronic conditions to life-threatening states. Among the strategies to manage pulmonary bleeding is bronchial artery embolisation (BAE), an interventional radiology procedure. The objective of this scoping review was to map the current evidence on embolic agents used in BAE for haemoptysis management, with a focus on their clinical applications, and decision-making factors. Studies published between 2019 and 2024 were included if they specified the embolic material used and reported outcomes of BAE in adult patients. Data were extracted from PubMed and charted according to embolic agent type, recurrence rate, and clinical context. Thirty-one studies met the eligibility criteria. Polyvinyl alcohol (PVA) remains the most widely studied agent, comparable in efficacy to more homogeneous microspheres. Gelatin sponges (GS), though biodegradable, are well-documented and affordable, making them a common choice. N-butyl-2-cyanoacrylate (NBCA) is highly effective for small vessels and may offer lower recurrence rates. Coils are valuable in proximal embolisation and severe cases. This review highlights the need for individualised embolisation strategies and updated guidelines for material selection, considering clinical context, vascular anatomy, and recurrence rates. The findings aim to support evidence-based decision-making in interventional radiology practice.

Introduction: Percutaneous renal biopsy (PRB) is the gold standard for diagnosing nephropathies, but it carries a risk of bleeding complications, mainly perinephric hematomas (PHs). While PH incidence is often reported, the significance of PH size remains insufficiently explored. This scoping review systematically mapped the evidence on PH size after ultrasound-guided PRB in adults, focusing on imaging modalities, measurement methods, the definition of ‘large’ PH, factors influencing PH size, and its clinical implications. Materials and Methods: Following the Joanna Briggs Institute methodology, we searched PubMed/MEDLINE, Embase, Cochrane CENTRAL, and Scopus through 27 August 2025. Eligible studies included at least 50 adult subjects undergoing ultrasound-guided PRB with quantitative, imaging-based assessment of PH size. Results: Fifty-one studies met the inclusion criteria. Almost all relied on ultrasound, with only one using computed tomography. PH size was measured using heterogeneous methods, most often one-dimensional diameters, less frequently surface area or volumetry, with no standardization. Reported PH frequencies varied substantially across studies (1.1–85%), likely reflecting differences in imaging protocols, timing, and reporting thresholds. Several studies proposed PH size thresholds (e.g., diameter ≥ 2–3 cm, volume ≥ 40–85 mL) linked to adverse outcomes such as transfusion or hemodynamic instability. Factors associated with larger PHs included needle gauge, number of passes, impaired kidney function, coagulopathy, and certain histopathologies. Conclusions: PH size has prognostic value beyond incidence alone. Standardized measurement and reporting are needed to clarify its clinical relevance after PRB.

Background/Objectives: Untreated hepatic abscesses (HAs) have an 80% mortality rate and can be caused by bacteria and fungi. Previously managed with surgery, current treatments now utilize interventional radiology and antibiotics, reducing complications to 2.5%. This study evaluates contrast-enhanced ultrasound (CEUS) for better drainage placement and monitoring, overcoming conventional ultrasound’s limitations in detecting the HA liquefied portion. Methods: We conducted a retrospective study of 50 patients with HAs confirmed via computed tomography (CT) scans. Inclusion criteria comprised specific clinical symptoms and laboratory parameters. Both B-mode and CEUS were utilized for initial and follow-up imaging. Results: In the CEUS studies, the mean size of HAs was 6.26 cm, with pus displaying significantly lower echogenicity compared to the HA pouch and liver parenchyma in all phases. Classification by size (>6 cm, 113 mL, <113 mL) revealed differences in the assessment of fluid volume between CEUS and B-mode. Conclusions: CEUS is valuable for diagnosing, performing therapeutic procedures, and monitoring HA. It provides precise real-time assessment of HA morphology, including dimensions and volume. If the liquefied volume of an HA exceeds 113 mL, it may qualify for drainage placement. CEUS can replace CT as an effective, less harmful, and cheaper method, eliminating the need for multiple radiological departments. While CEUS is a safer, cost-effective alternative to CT for HA evaluation and monitoring, comprehensive clinical evaluation remains essential. Therefore, CEUS should be part of a broader diagnostic and monitoring strategy, not a stand-alone solution.

Background Percutaneous renal biopsy (PRB) is the gold standard for diagnosing nephropathies but carries a risk of complications, most commonly perirenal hematoma (PH). Although usually minor, PH volume is rarely quantified, and ultrasound—the standard modality—has limited accuracy. Magnetic resonance imaging (MRI) enables precise volumetric assessment and may improve understanding of PH pathophysiology. Materials and methods This retrospective study included 138 patients (104 with native kidneys, 34 with grafts) who underwent kidney MRI 36–48 h after PRB. PHs were manually segmented on T1-weighted Dixon water-only images. Predictors of large PHs (upper tertile of volume) were identified using logistic regression, and model stability was evaluated with leave-one-out cross-validation (LOOCV). As an exploratory analysis, apparent diffusion coefficient (ADC) values were obtained from diffusion-weighted imaging (DWI) maps to assess correlations between renal diffusivity and PH volume. Results PH was detected in 89.9% of cases. Median PH volume was significantly lower in grafts than in native kidneys (9.3 mL vs. 20.95 mL, p = 0.030). Graft status was an independent negative predictor of large PH, while kidney volume (KV), diastolic blood pressure (DBP), and proteinuria were independent positive predictors. The final model showed moderate discriminative performance (AUC = 0.708). Lower ADC values correlated moderately and negatively with PH volume (rho = –0.41, p = 0.009). Conclusion MRI volumetry enables precise assessment of PH after PRB. Larger KV, higher DBP and proteinuria predicted greater PH volume, while graft status was protective. Lower renal parenchymal ADC values may reflect microstructural alterations predisposing to increased PH volume but warrants further evaluation in future studies.