A malignant neoplasm composed of glandular epithelial clear cells. Various architectural patterns may be seen, including papillary, tubulocystic, and solid. The disease is clear cell adenocarcinoma (MONDO_0005004). Also known as: adenocarcinoma, clear cell, malignant, clear cell adenocarcinoma (morphologic abnormality), clear cell adenocarcinoma NOS (morphologic abnormality), mesonephroma NOS (morphologic abnormality), water-clear cell adenocarcinoma, water-clear cell adenocarcinoma (morphologic abnormality).