Tubulocystic pattern with the presence of “Hobnail cells” and extracellular mucin are more in favour of clear cell carcinoma of the ovary, whereas the presence of solid sheets of clear cells and thin wall blood vessels surrounded by a pseudocapsule formed by the compressed parenchyma and fibrous tissue are all in favour of renal cell carcinoma—clear cell type [10]. The gene discussed is MUC5AC; the disease is hereditary clear cell renal cell carcinoma.