NK/T-cell lymphoma, light micrograph. NK/T-cell neoplasms are almost exclusively extranodal and include extranodal NK/T-cell lymphoma (nasal type), aggressive NK-cell leukaemia, chronic lymphoproliferative disorder of NK cells, and NK lymphoblastic leukaemia/lymphoma. The most common site of involvement in NK/T-cell lymphoma is the nasal cavity. NK/T-cell lymphoma shows angiocentric and angioinvasive growth leading to ischemic necrosis and ulceration of the involved tissues as seen here. Areas of geographic necrosis, haemorrhage, and fibrinoid exudates are common.