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Kidney Pathology and Diseases
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Kidney Pathology and Diseases
Kidney Pathology and Diseases
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1
Question
What are the primary functions of the kidney?
Answer
The kidneys function in excretion of waste products, regulation of water and salt balance, maintenance of acid/base balance, and secretion of hormones.
2
Question
How much blood do the kidneys process daily, and what is the output?
Answer
The kidneys convert more than 1700 liters of blood per day into about 1 liter of highly specialized concentrated urine.
3
Question
What are the two main structural regions of the kidney?
Answer
The kidney is divided into an outer cortex and an inner medulla.
4
Question
What is the functional unit of the kidney, and what are its main components?
Answer
The nephron is the functional unit of the kidney and consists of a renal corpuscle (which includes the glomerulus, a tuft of capillaries) and many tubules and ducts.
5
Question
What are the main categories of glomerular diseases listed in the outline?
Answer
Glomerular diseases include nephrotic syndrome (e.g., minimal change glomerulopathy, focal segmental glomerulosclerosis, systemic diseases like diabetes) and nephritic syndrome (e.g., postinfectious glomerulonephritis, IgA nephropathy, rapidly progressive glomerulonephritis).
6
Question
What key pathological change initiates nephrotic syndrome?
Answer
A derangement in the capillary walls of the glomeruli, causing increased permeability to plasma proteins, initiates nephrotic syndrome.
7
Question
What are the characteristic features of nephrotic syndrome?
Answer
Nephrotic syndrome is characterized by proteinuria and hypoproteinemia, edema, and hyperlipidemia.
8
Question
Which clinical signs define nephritic syndrome?
Answer
Nephritic syndrome is characterized by hematuria, oliguria (reduced urine output), and hypertension.
9
Question
What is chronic glomerulonephritis and its significance?
Answer
Chronic glomerulonephritis is an important cause of end-stage renal disease presenting as chronic renal failure, characterized by advanced scarring and sometimes complete hyalinization of glomeruli.
10
Question
What are typical gross and microscopic features of chronic glomerulonephritis?
Answer
Grossly, kidneys are symmetrically contracted with red-brown, diffusely granular surfaces. Microscopically, there is advanced glomerular and Bowman's space scarring, sometimes replacing the glomeruli entirely.
11
Question
What defines acute renal failure and its common causes?
Answer
Acute renal failure is dominated by oliguria or anuria and recent onset azotemia; it can result from glomerular, interstitial, vascular injury, or acute tubular necrosis.
12
Question
How is chronic renal failure related to uremia and azotemia?
Answer
Chronic renal failure involves prolonged symptoms/signs of uremia, which is azotemia accompanied by clinical and biochemical abnormalities. It is the end stage of chronic renal parenchymal diseases.
13
Question
What is acute pyelonephritis and what part of the kidney does it primarily affect initially?
Answer
Acute pyelonephritis is a suppurative bacterial inflammation of the kidney and renal pelvis that initially affects the interstitial tissue but later also involves the tubules.
14
Question
What is the relationship between urinary tract infections (UTIs) and acute pyelonephritis?
Answer
Acute pyelonephritis is an important manifestation of UTIs, which can involve the lower urinary tract (cystitis, prostatitis, urethritis), the upper urinary tract (pyelonephritis), or both.
15
Question
What populations are most commonly affected by Urinary Tract Infections (UTIs)?
Answer
Women, the elderly, and patients with catheters or urinary tract malformations are most commonly affected by UTIs.
16
Question
What are the typical clinical symptoms of a Urinary Tract Infection?
Answer
The typical clinical symptoms include dysuria (painful urination) and increased frequency of urination.
17
Question
Which organisms are commonly responsible for Urinary Tract Infections?
Answer
E. coli and Proteus species are commonly responsible for UTIs.
18
Question
What is Chronic Pyelonephritis and how is it characterized morphologically?
Answer
Chronic Pyelonephritis is a morphologic entity characterized by interstitial inflammation and scarring of the renal parenchyma, along with grossly visible scarring and deformity of the pelvicalyceal system.
19
Question
What are the two forms of Chronic Pyelonephritis?
Answer
The two forms are (1) chronic obstructive pyelonephritis and (2) chronic reflux-associated pyelonephritis.
20
Question
Describe the microscopic morphology seen in Chronic Pyelonephritis.
Answer
Microscopically, there is uneven interstitial fibrosis with inflammatory infiltrate of lymphocytes, plasma cells, and occasionally neutrophils. Tubules show dilation or contraction with atrophy of the lining epithelium, and many dilated tubules contain pink to blue, glassy colloid casts, a pattern called thyroidization.
21
Question
What are the three ways toxins and drugs can induce renal injury?
Answer
They can (1) trigger an interstitial immunologic reaction (like acute hypersensitivity nephritis), (2) cause acute renal failure, or (3) cause subtle but cumulative tubular injury leading to chronic renal insufficiency over years.
22
Question
What characterizes Acute Drug-Induced Interstitial Nephritis clinically and what is its typical time of onset?
Answer
It typically occurs about 15 days after exposure to drugs such as penicillins, rifampin, thiazides, and NSAIDs. It is characterized by fever, eosinophilia, rash, renal abnormalities like hematuria and mild proteinuria, and about 50% develop acute renal failure with oliguria.
23
Question
What histological features are seen in Acute Drug-Induced Interstitial Nephritis?
Answer
Histologically, there is interstitial edema and infiltration by mononuclear cells (mainly lymphocytes and macrophages), with possible eosinophils and neutrophils. Tubulitis (lymphocyte infiltration of tubules) is common. Tubular necrosis and regeneration may be present, while glomeruli are usually normal.
24
Question
What is Analgesic Nephropathy and what causes it?
Answer
Analgesic Nephropathy is a chronic renal disease caused by excessive intake of analgesic mixtures (like aspirin and acetaminophen). It is characterized morphologically by chronic tubulointerstitial nephritis combined with renal papillary necrosis.
25
Question
What mechanisms contribute to papillary damage in Analgesic Nephropathy?
Answer
Papillary damage results from a combination of the direct toxic effects of drug metabolites and ischemic injury to tubular cells and vessels.
26
Question
What serious complication can arise in patients with Analgesic Nephropathy?
Answer
A small percentage of patients develop transitional papillary carcinoma of the renal pelvis.
27
Question
Describe the gross morphology of Analgesic Nephropathy.
Answer
Grossly, the renal papilla appears as a brownish necrotic, structureless mass filling the pelvis due to papillary necrosis.
28
Question
What is the significance of 'thyroidization' in Chronic Pyelonephritis?
Answer
Thyroidization refers to the appearance of dilated tubules filled with glassy, colloid-like casts resembling thyroid follicles, indicating tubular atrophy and chronic damage.
29
Question
What age group is most commonly affected by Wilms' tumor?
Answer
Wilms' tumor primarily occurs in infants, with 50% of cases happening before the age of 3 years.
30
Question
How does Wilms' tumor typically present clinically?
Answer
Wilms' tumor classically presents as an abdominal mass felt by the mother when handling the child.