Histologic transformation to diffuse large B cell lymphoma with profuse signet‐ring cell change in bone marrow and lymph node biopsies in a patient with marginal zone lymphoma. A cytologic‐histologic correlation. Issue 10 (19th July 2016) - Machado, Isidro; Lavernia, Javier; Illueca, Carmen; Salazar, Claudia; Mengual, José Luis; Llombart‐Bosch, Antonio