Fatty tissue holds the kidneys in place. extremely rapid weight loss may cause this tissue to shrink so that the kidneys slip from their normal position. on rare occasions, the slippage can put a kink in one or both ureters and block urine flow. suggest what might then happen to the kidneys.

The correct answer is renal ptosis or nephroptosis.

Explanation:

Nephroptosis or renal ptosis or floating kidney is the rare condition of kidney descending more than two vertebral or more than 5 cm. Fatty tissue holds the kidneys in their place. Weight loss can result in the loss of such tissue and the displacement or slippage of the kidney.

This condition can cause many severe symptoms such as extreme flank pain and block urine flow. The kidney drop to the pelvic region is known as nephroptosis.

Thus, the correct answer is renal ptosis or nephroptosis.