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What renal stones are vegetarians at risk for?

calcium oxalate
(due to hyperoxaluria)

What is the most common type of renal stones?

calcium oxalate +/- calcium phosphate

What is the 2nd most common renal stone?

magnesium ammonium phosphate

What is the 3rd most common renal stone?

uric acid

What increases the likelihood of uric acid stones?

acidic urine

What is the underlying cause of magnesium ammonium phosphate renal stones?

Proteus infection
(convert urea to ammonia)

What is the only renal stone that appears radiolucent?

uric acid stones

What type of renal stones can be caused by hyperparathyroidism?

calcium oxalate +/- calcium phosphate

What type of renal stones can be cause by sarcoidosis?

calcium oxalate +/- calcium phosphate

What is the cause of staghorn ccalculi?

Proteus infection

Pts with gout or leukemia/lymphoma are at risk for what type of renal stones?

uric acid

What disorder predisposes pts to cystine renal stones?

hereditary cystinuria

Pt presents with flank pain, radiating to groin and gross hematuria with no casts. Possible dx?


What are potential complications of renal pelvis stones?

pyelonephritis and hydronephrosis

What are 4 benign renal tumors?

Renal adenoma
Medullary fibroma

What are 3 malignant renal tumors?

Wilms' tumor (Nephroblastoma)
Renal cell carcinoma (RCC)
Urothelial (transitional cell) tumors

What is the most common renal tumor?

renal cell carcinoma

Where do renal cell carcinomas arise from?

renal tubules

What is a common mutation involved in renal cell carcinoma?
What chromosome is it found on?

VHL gene
→ chromosome 3

What doubles the risk for renal cell carcinoma? Other risk factors?

also obesity, HT, asbestos, petroleum, heavy metals, CRF, tuberous sclerosis

What syndrome is characterized by renal cysts, renal cell carinomas, cerebellar hemangioblastoma, and pheocromocytoma?

von Hippel-Lindau syndrome

What familial renal cell carcinoma disorder has the VHL mutation but lacks the other characteristic s of VHL syndrome?

familial clear cell carcinoma

What autosomal dominant disorder presents with bilateral tumors and has a Met proto-oncogene mutation?

hereditary papillary carcinoma

What is the most common histological type of renal cell carcinoma?

clear cell carcinoma (70-80%)
→ filled with glycogen, lipid

What is the histological pattern of papillary carcinoma?

cuboidal or low columnar cells
w/ interstitial foamy macrophages

What is the histological pattern of chromophobe carcinoma?

Solid sheets of pale eosinophilic cells, perinuclear halos, discrete cell membranes (vegetable like cells)

What type of stain can help differentiate a chromophobe renal cell carcinomas from an oncocytoma?

+ colloidal iron stain

Metastatic clear cell carcinoma is found in the liver, where do you want to look for the primary tumor?


What ectopic hormones can be produced by a renal cell carcinoma?

Epo, Renin, PTH-like, ACTH

What is the classic triad of renal cell carcinoma presentation?

palpable abdominal mass
dull flank pain

What carcinoma mimics a true renal sarcoma?
Which renal cell carcinoma can change into this?

sarcomastoid renal cell carcinoma
→ any

What small renal tumor arises from renal tubules, usually having a papillary architecture, has no atypia or clear cells and is a common incidental finding at autopsy?

renal adenoma

What is a benign tumor of the renal collecting ducts can sometimes present grossly with a central scar and microscopically is made up of uniform cells with abundant granular eosinophilic cytoplasm?


What are the cytoplasm of cells in an oncocytoma filled with?


What benign tumor of vessels, smooth muscle and fat is the most common renal tumor in pts with tuberous sclerosis?


What is a benign fibroblastic tumor of the renal medulla?

renal medullary fibroma

What gene is responsible for wilm's tumor? What chromosome is involved?

WT1 and WT2
→ chromosome 11

Pt presents with hemihypertrophy, macroglosia, and wilm's tumor (WT2). What syndrome would this be?

Beckwith Wiedman syndrome

What makes up the triphasic nature of Wilm's tumor?

The epithelial elements (E) surround nodules of blastema (B).
The nodules of blastema are separated by myxoid stroma (S)

Cartilage, bone and muscle tissue can also be seen in what renal tumor?

Wilm's tumor

What cell type do urothelial tumors arise from?

transition cell tumor

What disorder primarily presents as painless hematuria?

urothelial tumor

What percent of urothelial tumors are malignant?


What is the major risk for urothelial tumors?

tobacco smoke (3-7x risk)
(also azo dyes, rubber industry, painters)

What parasitic infection can increase the risk of urothelial tumors?

chronic cystitis cause by organism like Schistosoma hematobium

What cancer drug can increase the risk for urothelial tumors?


Non-invasive urothelial tumors have a deletion of which chromosome, affecting what gene?

chromosome 9
→ p16INK4a

Invasive urothelial tumors have a deletion of which chromosome, affecting what gene?

chromosome 17p
→ p53

What are the two types of papillary urothelial tumors?

exophytic papilloma (left)
inverted papilloma (right)

What tumor is a urothelial neoplasm of low malignant potential similar to?

→ slightly thicker epithelium or mild nuclear enlargement

A urothelial carcinoma shows thick papillary urothelium, mild atypia, occasional mitoses. How would you grade this tumor?

low grade papillary carcinoma

A urothelial carcinoma shows you moderate atypia and mitoses, as well as signs of necrosis. Grade this tumor.

high grade urothelial carcinoma

Urothelial biopsy shows full thickness atypia with an intact basement membrane. Likely dx?
What is the likelihood this becomes invasive?

urothelial carcinoma in situ
→ (50-75% chance of becoming invasive)

What increases the risk for squamous cell carcinoma of the bladder?

indwelling catheter

What is the intermediate process occurs in the bladder between schistosomiasis and squamous cell carcinoma?

squamous metaplasia

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