Bilateral renal cortical calcification

Case contributed by Dr Mahmoud Ibrahim Mekhaimar


Impaired renal function, no relevant perinatal history. Renal biopsy was performed, complicated by hemoperitoneum for which a pelvic drain was inserted.

Patient Data

Age: 1 year
Gender: Male

Pronounced bilateral renal cortical hypergenicity, most likely representing calcification. Free fluid collection in the hepatorenal fossa.

NECT examination confirmed the findings of:

Bilateral renal cortical calcification.

Free abdominopelvic fluid collection.

Pneumoperitoneum (air loculi) seen anterior to the left hepatic lobe.

NB: the pelvic drain is partially seen.

Case Discussion

Bilateral renal cortical calcification, suspicious for cortical nephrocalcinosis.


Microscopic examination reveals one core of renal corticomedullary tissue. Seventeen glomeruli are detected; one of which is obsolescent. The tufts show focal ischemic changes and thickening of the glomerular basement membrane with focal double contouring pattern. Few glomeruli show a bloodless pattern and some glomeruli contain thrombi. Single glomerulus shows segmental sclerosis and another one is compressed by a fibrocellular crescent. The tubules show marked hydropic degeneration with patchy injury, foci of tubulitis, and many foci of microcalcification, as well as hyaline and red cell casts, are seen.  The interstitium shows edema, moderate lymphocyte infiltration, and patchy mild fibrosis.  The arteries are normal. Some arterioles show mucoid intimal thickening and few arterioles show extravasated, fragmented RBCs in the wall. JGAs are normal.

Diagnosis:  The picture is compatible with healing stage of thrombotic microangiopathy with secondary focal segmental glomerulosclerosis. 

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Case information

rID: 61421
Published: 12th Jul 2018
Last edited: 19th Aug 2019
Inclusion in quiz mode: Included
Institution: kasr al ainy medical school

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