QuestionSBA
QuestionChoice
This accounts for around 5-10% of renal stones and is radio-lucent.
10005488
c
Uric acid
QuestionChoice
This is the most common type of renal stone and has an opaque radiographic appearance.
10005487
b
Calcium oxalate
QuestionChoice
This is a rare type of stone accounting for just 1% and is semi-opaque with a 'ground-glass' radiographic appearance.
10005490
e
Cystine
QuestionChoice
Staghorn calculi involve the renal pelvis and extend into at least two calyces. They develop in alkaline urine as in this case and are composed of struvite (ammonium magnesium phosphate, triple phosphate). Ureaplasma urealyticum and Proteus infections predispose to their formation.
10005486
a
Struvite
QuestionChoice
This accounts for 10% of renal stones and has an opaque radiographic appearance.
10005489
d
Calcium phosphate
Concept
Chapter
2693
4413
Renal Stones
Topic
142
Nephrology
13644
A 40-year-old woman with episodes of recurrent Proteus mirabilis urinary tract sepsis presents with a suspected staghorn calculus of her right kidney. Her urinary pH is 7.2. An x-ray of the kidneys, ureter and bladder shows branching calcific densities overlying the renal outline in keeping with a staghorn calculus.

Which of the following is the most likely type of stone?
a