The case reported by Cozzutto et al. and those studied by Finegold featured changes of renal dysplasia including immature tubules surrounded by a collarette of cellular mesenchyme, glomeruloid figures, tubules and nests of cartilage in a background of adipose tissue and fibrous tissue where muscle fibres, nerve bundles, and calcospherites were also seen.
The two cases reported by Posalaki et al. showed blastema, glomeruli, and tubuli.
Alston et al. described immature renal tissue in a lumbosacral subcutaneous lipoma with intradural extension in a 6-day-old female.
[5] Horestein et al. reported a lumbosacral nephrogenic rest including blastema (mature tubules and nephrons) in abundant stroma unassociated to spinal dysraphism.
[6] The case reported by Ibrahim et al. in a 2-year-old boy comprised adipose and fibrous tissue with neuroglial elements, striated muscle fibres and clusters of glomeruloid structures and immature tubules.