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Related Concept Videos

Imaging Studies II: Ultrasonography01:24

Imaging Studies II: Ultrasonography

IntroductionUltrasonography, or renal ultrasound, is a noninvasive medical imaging technique that uses high-frequency sound waves to visualize the kidneys, ureters, bladder, and surrounding tissues.Indications for Urinary System UltrasonographyUrinary system ultrasonography is indicated in various clinical scenarios, such as:Kidney Stones (Urolithiasis): To detect and monitor the size and presence of kidney or urinary tract stones.Hydronephrosis: To assess the dilation of the renal pelvis and...
Imaging Studies III: Computed Tomography01:27

Imaging Studies III: Computed Tomography

DefinitionComputed Tomography (CT) of the genitourinary (GU) tract is a non-invasive imaging modality that utilizes X-rays and computer processing to generate detailed cross-sectional images of the urinary system, encompassing the kidneys, ureters, bladder, and adjacent structures such as the adrenal glands.PurposeCT scans of the GU tract serve several diagnostic and therapeutic purposes, including:Diagnosis of Urinary Tract Diseases: Detects kidney stones, tumors, cysts, and congenital...
Imaging Studies V: Intravenous Urography and Retrograde Pyelography01:22

Imaging Studies V: Intravenous Urography and Retrograde Pyelography

IntroductionIntravenous Urography (IVU) and Retrograde Pyelography (RP) are important diagnostic imaging techniques used to evaluate the urinary system. These methods help identify structural abnormalities, obstructions, and functional issues in the kidneys, ureters, and bladder. Both procedures use iodine-based contrast media to enhance the visibility of urinary tract structures on X-ray images, though they differ in their methods and indications.1. Intravenous Urography (IVU)Intravenous...
Imaging Studies I: Kidney, Ureter, and Bladder Studies01:28

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Kidney, Ureter, and Bladder (KUB) StudiesKidney, Ureter, and Bladder (KUB) studies are standard diagnostic imaging procedures used to assess the anatomy of the urinary system. They are commonly utilized for patients experiencing abdominal pain or urinary symptoms. By using a simple X-ray of the abdomen, KUB studies can reveal structural and pathological abnormalities within the kidneys, ureters, and bladder. These studies are particularly valuable in diagnosing kidney stones, urinary...
Imaging Studies VII: Vascular Imaging01:19

Imaging Studies VII: Vascular Imaging

DefinitionRenal angiography, also known as renal arteriography, is an imaging technique used to obtain a comprehensive view of blood flow and the vascular structure of blood vessels in the kidneys and surrounding areas.PurposeRenal angiography detects blood vessel abnormalities in the kidneys, such as aneurysms, stenosis, thrombosis, vascular tumors, and renal artery stenosis. It evaluates kidney function and guides interventional treatments like angioplasty or stent placement.Pre-Procedure...
Imaging Studies IV: Magnetic Resonance Imaging01:27

Imaging Studies IV: Magnetic Resonance Imaging

Introduction:Magnetic Resonance Imaging, or MRI, can include a specialized imaging technique of the urinary system known as Magnetic Resonance Urography (MRU). This radiation-free technique uses strong magnetic fields and radio waves to produce detailed images with the help of a computer. MRU is particularly effective for visualizing fluid-filled structures like the kidneys, ureters, and bladder.Applications of MRI in the Genitourinary SystemKidneys and Ureters: MRI detects tumors, cysts,...

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WHO 2022 Renal Cell Tumor Classification: Imaging Features and Clinical Implications.

Masahiro Jinzaki1, Refky Nicola2, Samuel J Withey3

  • 1Department of Radiology, Keio University School of Medicine, 35 Shinanomachi, Shinjuku-ku, Tokyo 160-8582, Japan.

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The 2022 World Health Organization classification for renal cell tumors introduces new categories for rare subtypes. Radiologists and pathologists must carefully evaluate imaging features to distinguish these from common types for accurate diagnosis and treatment.

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Area of Science:

  • Pathology
  • Radiology
  • Oncology

Background:

  • The World Health Organization (WHO) classification of renal cell tumors was updated in 2022.
  • The fifth edition introduced significant changes, including new categories for rare renal tumors.

Purpose of the Study:

  • To outline the key changes in the 2022 WHO classification of renal cell tumors.
  • To highlight the characteristics of newly introduced categories: other renal tumors and molecularly defined renal carcinomas.
  • To emphasize the importance of radiologic-pathologic correlation for accurate diagnosis of rare renal tumor subtypes.

Main Methods:

  • Review of the 2022 WHO classification of renal cell tumors.
  • Analysis of histopathologic and molecular features of renal neoplasms.
  • Evaluation of radiologic findings, including CT enhancement patterns.

Main Results:

  • Epithelial renal tumors are now divided into six categories, with two new categories for rare subtypes.
  • Papillary renal cell carcinoma (pRCC) type 2 is reclassified, leading to overlapping imaging features with other rare tumors.
  • Specific imaging features (age, growth pattern, enhancement, T2 signal, metastases) can help differentiate rare subtypes from typical pRCCs.

Conclusions:

  • The updated classification necessitates careful radiologic and pathologic assessment.
  • Recognizing subtle differences in imaging features is crucial for suspecting rare renal tumor subtypes.
  • Accurate diagnosis guides urologists in surgical planning and pathologists in selecting diagnostic tests.