Urothelial Carcinoma of the Renal Pelvis with Synchronous Ipsilateral Collecting Duct Carcinoma: Two Case Reports.

Synchronous renal malignancies are seldom encountered or diagnosed post-renal resection. A combination of renal cell carcinoma (RCC) and urothelial carcinoma (UC) is most commonly reported. Typically, the RCC subtype is clear-cell RCC; however, a combination of collecting duct carcinoma (CDC) and UC has rarely been reported in the existing literature. Here, we present two cases of synchronous renal malignancy, specifically a combination of CDC and UC, in the ipsilateral kidney.

Imaging features of hyperacute intracerebral hemorrhage on multiple MRI sequences within 1 minute from onset during MRI examination: A case report.

RATIONALE: Acute stroke requires accurate imaging to ensure appropriate treatment decisions and favorable clinical outcomes. Computed tomography has long been used as an exclusive imaging technique to assess intracerebral hemorrhage, owing to its rapid scanning time and widespread availability. Several recent studies have reported the reliable detection of hyperacute hemorrhage using magnetic resonance imaging (MRI). PATIENT CONCERNS: An 88-year-old woman with a history of hypertension presented with mild, acute dysarthria. The National Institutes of Health Stroke Scale score was 1. DIAGNOSES: Non contrast head computed tomography revealed the absence of acute cerebral hemorrhage. The patient underwent magnetic resonance, revealed hyperacute intracerebral hemorrhage within a few minutes of its occurrence on multiple MRI sequences. INTERVENTIONS AND OUTCOMES: In this patient, hemorrhage developed during MRI for acute ischemic stroke. Hemorrhage was initially misdiagnosed, and inappropriate treatment severely affected the patient's health. LESSONS: Clinicians in the Department of Neurological Emergency should be familiar with imaging findings of hyperacute hemorrhage on multiple MRI sequences.

Aortic Arch Variants and Anomalies: Embryology, Imaging Findings, and Clinical Considerations.

There is a wide spectrum of congenital anomalies or variations of the aortic arch, ranging from non-symptomatic variations that are mostly detected incidentally to clinically symptomatic variations that cause severe respiratory distress or esophageal compression. Some of these may be accompanied by other congenital heart diseases or chromosomal anomalies. The widespread use of multidetector computed tomography (CT) in clinical practice has resulted in incidental detection of several variations of the aortic arch in adults. Thus, radiologists and clinicians should be aware of the classification of aortic arch anomalies and carefully look for imaging features associated with a high risk of clinical symptoms. Understanding the embryological development of the aortic arch aids in the classification of various subtypes of aortic arch anomalies and variants. For accurate diagnosis and precise evaluation of aortic arch anomalies, cross-sectional imaging modalities, such as multidetector CT or magnetic resonance imaging, play an important role by providing three-dimensional reconstructed images. In this review, we describe the embryological development of the thoracic aorta and discuss variations and anomalies of the aortic arch along with their clinical implications.