<prompt> Koenons periungual fibroma is a feature of?Kawasakis diseaseRefsum diseaseDarriers diseaseBournevilles disease  <response>: Ans. is d i.e., Bournevilles disease Periungual fibromas Koenons tumor are seen in 20 of patients of tuberous sclerosis.Tuberous sclerosis Bournevifles disease Tuberous sclerosis is characterized by : -A. Skin lesions: - Adenoma sebaceum Facial angiofibroma, Ash-leaf shaped hypopigmented maculespatch, Shagreen patch Yellow thickening of lumbosacral skin, depegmented nevi, Periungual fibromas Koenens tumor.B. Neurological: - Mental retardation, Seizures, Hydrocephalus, Subependymal calcified nodules.C. Neoplasms: - Subependymal giant cell astrocytoma, ependymoma, rhabdomyomas of heart, angiomyomas of the kidney, liver, adrenal and pancreas. 