Different clinical forms of NK/T-cell lymphomas. (A) Nasal lymphoma showing an initial ulcer (left) that ultimately perforated into the oral cavity, creating a communication between the oral cavity and the nasal cavity. In the past, such a lesion was referred to as “lethal midline granuloma.” (B) Lymphoma initially localized to the calf, presenting as nonhealing ulcers. PET/CT showed occult nasal involvement. This case could be erroneously classified as “nonnasal” lymphoma. (C) Aggressive NK-cell leukemia showing neoplastic cells that were large granular lymphocyte in morphology in the peripheral blood and in the bone marrow (arrow).