Autosomal dominant polycystic kidney disease in infant and fetus
Introduction
ADPKD is typically diagnosed in adults but may be
rarely recognized in an infant or even fetus (early-onset
disease). Involvement of glomeruli and formation of glomerulal
cysts predominante which is in contrast with histological
findings in late-onset disease.
Etiology
- Early-onset form of ADPKD is associated with mutations in gen
PKD 1 (chromosome 16).
- The pattern of inheritance is autosomal
dominant.
Clinical signs
- The manifestation of early onset disease includes oligohydramnion,
Potter sequence, end-stage renal failure and early-onset hypertension.
- The prognosis of early-onset disease is poor. Nearly 45% of cases
presenting in utero or in the early postnatal period die before 1 year of age.
The survivors develope hypertension at a mean age of 3 years and some of them
rapidly progress to end-stage renal failure.
- The recognition of the dominant polycystic kidneys in a newborn or fetus
may antedate the clinical onset of the disease in a parent.
Macroscopic appearance
- Nephromegaly.
- Sonograpic findings: moderately enlarged kidneys, increased corticomedullar
difference (hyperechogenic cortex, hypoechogenic medulla).
Less often obvious cysts.
ADPKD (72881)
ADPKD, detail of the kidney (72882)
Pictures
21-week fetus, nephromegaly (double the normal size), early onset ADPKD:
Polycystic kidney, fetus, Macro, autopsy (72880)
Polycystic kidney, fetus, Macro, autopsy (72881)
Polycystic kidney, cross section:
Polycystic kidney, fetus, Macro, autopsy (72882)
Histology
Plentiful cysts wich represent dilated Bowmans spaces
of glomeruli. Glomerulal tufts clearly seen in some of the
cyst walls.