Cystic Renal Disease, for USMLE Step One. Howard J. Sachs, MD
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1 Cystic Renal Disease, for USMLE Step One Howard J. Sachs, MD
2 The Major Players Medullary Sponge Kidney (MSK) Polycystic Kidney Disease (PKD) Autosomal Recessive: Childhood Autosomal Dominant: ADult
3 Medullary Sponge PCKD (childhood) PCKD (adult) Auto Dominant (chromosome 16) Unknown Cystic dilations of the terminal collecting ducts in the medulla Small cysts (elongated channels) Large cysts replace parenchyma Incidental finding on radiograph Normal renal function (see next) Nephrolithiasis Hepatic fibrosis Oligohydramnios (can t make hydramnios if you can t pee!) Polycystic liver Berry Aneurysms
4 Medullary Sponge PCKD (childhood) PCKD (adult) Unknown Not testworthy putative mechanisms Auto Dominant (chromosome 16) Cystic dilations of the terminal collecting ducts in the medulla Small cysts (elongated channels) Large cysts replace parenchyma Incidental finding on radiograph Normal renal function (see next) Nephrolithiasis Hepatic fibrosis Oligohydramnios (can t make hydramnios if you can t pee!) Polycystic liver Berry Aneurysms
5 Medullary Sponge PCKD (childhood) PCKD (adult) Unknown (congenital) Pyramids Auto Dominant (chromosome 16) Cystic dilations of the terminal collecting ducts in the renal medulla Small cysts (elongated channels) Large cysts replace parenchyma Incidental finding on radiograph Normal renal function Nephrolithiasis Hepatic fibrosis Oligohydramnios (can t make hydramnios if you can t pee!) (see next) 1. Dilated (ectatic) 2. Collecting ducts Polycystic liver 3. Medullary portion (not Berry cortical) Aneurysms
6 Medullary Sponge PCKD (childhood) PCKD (adult) Auto Dominant (chromosome 16) Unknown (congenital) Cystic dilations of the terminal collecting ducts in the renal medulla Small cysts (elongated channels) Large cysts replace parenchyma Incidental finding on radiograph Normal renal function Nephrolithiasis Hepatic fibrosis Oligohydramnios (can t make hydramnios if you can t pee!) (see next) 1. Medullary Nephrocalcinosis 2. Nephrolithiasis Polycystic liver Berry Aneurysms
7 Medullary Sponge PCKD (childhood) PCKD (adult) Auto Dominant (chromosome 16) Unknown Cystic dilations of the terminal collecting ducts in the renal medulla Small cysts (elongated channels) Large cysts replace parenchyma Incidental finding on radiograph Normal renal function Nephrolithiasis 1. Dilated (ectatic) 2. Collecting ducts 3. Medullary portion Hepatic fibrosis Oligohydramnios (can t make hydramnios if you can t pee!) (see next) Polycystic liver Berry Aneurysms
8 AR-PCKD (childhood) AD-PCKD (adult) Auto Dominant (chromosome 16) Small cysts (elongated channels) Large cysts replace parenchyma Hepatic fibrosis Oligohydramnios ( (see next) Polycystic liver Berry Aneurysms
9 PCKD (childhood) PCKD (adult) Auto Dominant (chromosome 16) Small cysts (elongated channels) Large cysts replace parenchyma Hepatic fibrosis Oligohydramnios (can t make hydramnios if you can t pee!) (see next) Polycystic liver Berry Aneurysms
10 PCKD (childhood) PCKD (adult) Auto Dominant (chromosome 16) Small cysts (elongated channels) 1. Disease mechanism loosely defined. 2. multiple mutations protein 3. Extra-renal manifestations Large cysts replace parenchyma (see next) Hepatic fibrosis Oligohydramnios (can t make hydramnios if you can t pee!) Polycystic liver Berry Aneurysms
11 PCKD (childhood) PCKD (adult) Auto Dominant (chromosome 16) Small cysts (elongated channels) 1. Disease mechanism loosely defined. 2. multiple mutations protein 3. Extra-renal manifestations Large cysts replace parenchyma (see next) Hepatic fibrosis Oligohydramnios (can t make hydramnios if you can t pee!) Polycystic liver Berry Aneurysms
12 PCKD (childhood) PCKD (adult) Auto Dominant (chromosome 16) Small cysts (elongated channels) Large cysts replace parenchyma Hepatic fibrosis Oligohydramnios (see next) Polycystic liver Berry Aneurysms
13 Distal Nephron All Segments
14 PCKD (childhood) PCKD (adult) Auto Dominant (chromosome 16) Small cysts (elongated channels) Large cysts replace parenchyma (see next) Polycystic liver Berry Aneurysms
15 PCKD (childhood) PCKD (adult) Auto Dominant (chromosome 16) Small cysts (elongated channels) Large cysts replace parenchyma Reno-hepatic (see next) Polycystic liver Berry Aneurysms
16 PCKD (childhood) PCKD (adult) Auto Dominant (chromosome 16) Small cysts (elongated channels) Large cysts replace parenchyma (see next) Polycystic liver Berry Aneurysms
17 PCKD (childhood) PCKD (adult) Auto Dominant (chromosome 16) Small cysts (elongated channels) Large cysts replace parenchyma (see next) Reno-hepatic Hepatic fibrosis Oligohydramnios (Pulmonary hypoplasia) Polycystic liver Berry Aneurysms
18 PCKD (childhood) PCKD (adult) Auto Dominant (chromosome 16) Small cysts (elongated channels) Large cysts replace parenchyma (see next) Reno-hepatic Hepatic fibrosis Oligohydramnios (Pulmonary hypoplasia) Polycystic liver Berry Aneurysms
19 ARPKD: Reno-hepatic Background Cystic dilations of the renal collecting ducts with associated congenital defects of the hepatobiliary ducts congenital hepatic fibrosis Mutation(s) of the PKHD1 gene. Different mutations varied phenotypic expression (renal > = < biliary) Encodes fibrocystin (an integral membrane protein) found in the renal collecting ducts AND hepatic bile duct epithelial cells Enlarged kidneys with small (<2 mm) cysts radiating from medulla to the cortex interstial fibrosis. Biliary dysgenesis dilated intrahepatic ducts and congenital hepatic fibrosis.
20 ARPKD Elongated channels Number of ducts involved determine the severity of renal involvement
21 ARPKD: Reno-hepatic Clinical : depends on the mutation Prenatal: Seen on U/S with poor corticomedullary differentiation and oligohydramnios Neonatal: If renal disease was severe respiratory distress Adolescent: If renal disease less severe, may present with hepatic manifestation including s/s of portal HTN Special Notes Pulmonary hypoplasia is secondary to renal failure (oligohydramnios) Secondary manifestion ; may include Potter syndrome w/ associated limb and facial features
22 Adult PCKD (you can actually feel these things)
23 Adult PCKD HTN Hematuria Flank Pain
24 Adult PCKD Hepatic Cysts HTN Hematuria Flank Pain
25 ADhesion problem PKD1 Mutation (Polycystin-1) 1. Chromosome 16p 2. 85% of cases 3. More likely to progress to than PKD2 mutation
26 Extrarenal manifestations Presumably share same polycystin defect affecting biliary epithelium and vascular sm mm?
27 Risk Factors: FH aneurysm Poorly Controlled HTN (Majority rupture <50 y.o.)
28 ADPKD plus Background Autosomal dominant cystic renal disorder characterized by progressive renal failure and extrarenal manifestations. PKD1 (gene) polycystin-1 (protein); PKD2 polycystin-2 Membrane protein: cell-cell; cell-matrix interaction; cell proliferation Mechanism of cyst formation is uncertain (albeit interesting) large cyts
29 ADPKD plus Clinical Renal: Flank pain, (cysts, stones, infection), hematuria, CKD (progressive) Extrarenal: cerebral aneurysms (~10%), hepatic cysts Data Ultrasound: number of cysts that vary by age Genetic testing Special Notes Aneurysms: risk with FH, HTN, larger size; majority rupture < 50 y.o. Uncertain recommendation on screening although need to consider serial assessment (not a one and done) Age (40+): GFR 5 ml/min/yr ACE/ARB benefits beyond BP lowering (esp if proteinuria)
30 Medullary Sponge PCKD (childhood) PCKD (adult) Auto Dominant (chromosome 16) Unknown (congenital) Cystic dilations of the terminal collecting ducts in the renal medulla Small cysts (elongated channels) Large cysts replace parenchyma Incidental finding on radiograph Normal renal function Nephrolithiasis Hepatic fibrosis Oligohydramnios (can t make hydramnios if you can t pee!) Polycystic liver Berry Aneurysms Stones Liver (lung) ICH 2 Aneurysm
31 Cystic Renal Disease, for USMLE Step One Howard J. Sachs, MD
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