Monarch Disease Ontology entry MONDO_0017844 (Sezary syndrome) (SS) is an aggressive form of cutaneous T-cell lymphoma characterized by a triad of erythroderma, lymphadenopathy and circulating atypical lymphocytes (Sezary cells). Also known as: CTCL / Sezary syndrome, SC)zary syndrome, Sezary disease, Sezary lymphoma, Sezary's disease, Sheehan Syndrome, Sézary lymphoma, Sézary syndrome.