Pelviectasis exceeding 10 mm on prenatal imaging indicates which condition?

Pelviectasis exceeding 10 mm on prenatal imaging indicates which condition?

• A. Hydronephrosis
• B. Oligohydramnios
• C. Polycystic kidney disease
• D. Renal agenesis

Answer: (A)

Pelviectasis is dilation of the renal pelvis, which on prenatal ultrasound most often points to hydronephrosis when the collecting system becomes enlarged. A renal pelvis diameter exceeding about 10 mm is considered significant and characteristic of hydronephrosis in the fetus. This condition reflects urine buildup due to an outflow obstruction or reflux, and it’s the finding that best fits the measurement threshold described. Oligohydramnios refers to low amniotic fluid, which can accompany severe renal problems but isn’t defined by dilation of the renal pelvis itself. Polycystic kidney disease presents with multiple cysts and often enlarged, echogenic kidneys rather than isolated pelvis dilation. Renal agenesis means the kidney is absent on that side, so there isn’t a pelvis to dilate. In short, a pelvic diameter greater than 10 mm is the hallmark suggesting hydronephrosis.

Pelviectasis is dilation of the renal pelvis, which on prenatal ultrasound most often points to hydronephrosis when the collecting system becomes enlarged. A renal pelvis diameter exceeding about 10 mm is considered significant and characteristic of hydronephrosis in the fetus. This condition reflects urine buildup due to an outflow obstruction or reflux, and it’s the finding that best fits the measurement threshold described.

Oligohydramnios refers to low amniotic fluid, which can accompany severe renal problems but isn’t defined by dilation of the renal pelvis itself. Polycystic kidney disease presents with multiple cysts and often enlarged, echogenic kidneys rather than isolated pelvis dilation. Renal agenesis means the kidney is absent on that side, so there isn’t a pelvis to dilate. In short, a pelvic diameter greater than 10 mm is the hallmark suggesting hydronephrosis.