Which condition is the most common cause of papillary necrosis?

Which condition is the most common cause of papillary necrosis?

• A. Fever
• B. Analgesic abuse
• C. Diabetes
• D. Hypertension

Answer: (B)

Analgesic abuse is the most common cause of papillary necrosis because chronic exposure to analgesics, especially older phenacetin-containing regimens, leads to analgesic nephropathy with ischemic injury to the renal papillae. Over time this medullary ischemia can cause papillary necrosis and sloughing, which is the classic pathophysiology behind this condition. While diabetes, severe acute pyelonephritis, and sickle cell disease can also cause papillary necrosis, they are less likely than analgesic overuse in many patient populations. Fever itself isn’t a primary cause, and hypertension isn’t a typical direct contributor. Clinically, this can present with flank pain and hematuria, and imaging may show calyceal distortion or signs like the ring sign when a sloughed papilla is surrounded by contrast.

Analgesic abuse is the most common cause of papillary necrosis because chronic exposure to analgesics, especially older phenacetin-containing regimens, leads to analgesic nephropathy with ischemic injury to the renal papillae. Over time this medullary ischemia can cause papillary necrosis and sloughing, which is the classic pathophysiology behind this condition. While diabetes, severe acute pyelonephritis, and sickle cell disease can also cause papillary necrosis, they are less likely than analgesic overuse in many patient populations. Fever itself isn’t a primary cause, and hypertension isn’t a typical direct contributor. Clinically, this can present with flank pain and hematuria, and imaging may show calyceal distortion or signs like the ring sign when a sloughed papilla is surrounded by contrast.