This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Epilepsy and EEG, Subject name: Medicine
A child with mental retardation and skin rash on cheeks underwent a CT scan. The diagnosis of the child is? 
Select and explain. 
A. Tuberous sclerosis, B. Von Hippel Lindau, C. Sturge Weber syndrome, D. Ataxia telangiectasia
A: Tuberous sclerosis
Answer: A: Tuberous sclerosis 
Explanation: In the image on the left adenoma sebaceum is present, which looks like extensive acne in a butterfly distribution. The CT scan head shows a big lesion obliterating the ventricular system. It is a sub-ependymal nodule seen in tuberous sclerosis. A point against Sturge Weber is the absence of cutaneous lesion of Po wine stain. VHL is associated with cerebellar hemangioblastoma.