On a plain radiograph (X-ray) I reviewed recently, I encountered a classic lesion straight out of a textbook: A broad-based bony outgrowth located at the proximal medial metaphysis of the tibia, demonstrating clear corticomedullary continuity with the parent bone and projecting distally (downward) away from the growth plate. When we first encounter this image, a single term immediately comes to mind: Exostosis. However, right at this juncture, one of the most intriguing debat

1. Definition and Key Features Emphysematous pyelitis: Gas is confined only to the pelvicalyceal system, with no renal parenchymal involvement. Most commonly associated with obstructive urinary tract infections (e.g., stones) and gas-producing bacteria such as E. coli. Frequently seen in diabetic patients. 2. Radiological Findings Plain Radiograph Localized radiolucencies: Fine linear or clustered gas densities projected over the kidney, localized to the renal pelvi