Junctional parenchymal defect of kidney
Junctional parenchymal defects in renal imaging are a normal variant.
It results from the incomplete embryonic fusion of renunculi.
It can be seen as a triangular echogenic cortical defect, frequently seen in upper lobe parenchyma. The defect is the extension of sinus fat into the cortex, usually at the border of the upper pole and interpolar region of the kidney.
General imaging considerations include:
- 1. Carter AR, Horgan JG, Jennings TA et-al. The junctional parenchymal defect: a sonographic variant of renal anatomy. Radiology. 1985;154 (2): 499-502. Radiology (link) - Pubmed citation
- 2. Hélénon O, Merran S, Paraf F et-al. Unusual fat-containing tumors of the kidney: a diagnostic dilemma. Radiographics. 1997;17 (1): 129-44. doi:10.1148/radiographics.17.1.9017804 - Pubmed citation