The hypoechoic halo: A finding in renal lymphoma

Secondary renal neoplasms

“…6, 7). Extensive perinephric involvement appears as thick hypoechoic tissue that may completely surround one or both kidneys [24][25][26]. This extensive perinephric involvement tends to occur in stage IV disease [24].…”

“…This extensive perinephric involvement tends to occur in stage IV disease [24]. The differential diagnosis for hypoechoic perinephric soft tissue includes hematoma, uri- noma, abscess, and inflammation of Gerota's fascia [26].…”

Ultrasonographic Renal Subcapsular Thickening in Cats with Primary and Metastatic Carcinoma

“…Ultrasonographic renal subcapsular thickening is a distinctive finding in cats in veterinary medicine, primarily associated with conditions such as lymphoma or FIP [ 1 , 2 , 3 ]. In human medicine, a comparable phenomenon is described as a renal subcapsular hypoechoic rim or halo [ 24 , 25 , 26 , 27 , 28 ]. The causes of this finding in humans include renal artery occlusion [ 24 ], renal cortical necrosis [ 28 ], or renal lymphoma [ 25 , 26 , 27 ], corresponding to edematous perfused tissue fed by capsular collateral vessels, necrotic tissue, or infiltrating neoplastic tissue, respectively [ 29 ].…”

“…In human medicine, a comparable phenomenon is described as a renal subcapsular hypoechoic rim or halo [ 24 , 25 , 26 , 27 , 28 ]. The causes of this finding in humans include renal artery occlusion [ 24 ], renal cortical necrosis [ 28 ], or renal lymphoma [ 25 , 26 , 27 ], corresponding to edematous perfused tissue fed by capsular collateral vessels, necrotic tissue, or infiltrating neoplastic tissue, respectively [ 29 ]. In our study, the histopathological evaluation of the kidney with metastatic pulmonary carcinoma revealed necrotic tissue and neoplastic cells in the subcapsular thickening layer of the kidney.…”

Meyers' Dynamic Radiology of the Abdomen

“…6-112). 41,[192][193][194][195] Isolated perirenal involvement without either parenchymal or retroperitoneal disease is unusual and tends to appear as a plaque or ''rind'' of tissue partially or completely surrounding the kidney. These rinds are typically higher in attenuation than normal renal parenchyma on unenhanced CT but lower in attenuation on contrast-enhanced CT. …”