<prompt> Koenen;s tumour is seen inTuberous sclerosisNeurofibramatosisVHL syndromeTurcot syndrome  <response>: Tuberous sclerosis is a rare disease that causes tumors, or growths, in the brain and other organs. These growths can occur in the skin, kidneys, eyes, hea, or lungs. They are usually benign non-cancerous. The first signs of tuberous sclerosismay occur at bih. 