Langerhans cell sarcoma

Tumours derived from Langerhans cells (LCs) are divided into two main subgroups, according to the degree of cytological atypia and clinical aggressiveness: LC histiocytosis (LCH) and LC sarcoma (LCS). LCS is a high-grade neoplasm with obviously malignant cytologic features and the Langerhans cell phenotype, which is rare. Here the clinic-pathological of LCS will be discussed based on reported cases in the literature

Nodal marginal zone lymphoma (NMZL)

Nodal marginal zone lymphoma (NMZL) is a primary nodal B-cell neoplasm that morphlogically resembles lymph nodes involved by MZL of extranodal or splenic types. Two clinicopathological forms of NMZL are recognized: adult type and pediatric-type. NMZLs show overlapping features with other types of MZL, but distinctive features as well. NMZL remains an enigmatic entity with accompanying difficulties in diagnosis and a lack of knowledge of prognosis and treatment

Monomorphic PTLD (B- and T/NK-cell types)

Post-transplant lymphoproliferative disorders (PTLDs) are serious, life-threatening complications of transplantation, which represent a heterogeneous group of lymphoproliferative diseases and show a spectrum of clinical, morphologic, and molecular genetic features ranging from reactive polyclonal lesions to frank lymphomas. Monomorphic (M) PTLD fufill the criteria for one of the B-cell or T/NK cell neoplasms that are recognized in the immunocompetent host, which shows characteristic clinicopath

Primary cutaneous DLBCL, leg type

Primary cutaneous diffuse large B-cell lymphoma (PCDLBCL) leg type is an aggressive type of CBCL, characterized by skin lesions mainly on the legs and a predominance of diffuse sheets of centroblasts and immunoblasts. Given the poor prognosis, old age at onset, frequent relapses, and extracutaneous spread, PCDLBCL, leg type is a distinct type of cutaneous lyphoma. Here the clinicopathology of extranodal lymphomas will be discussed

Polymorphic PTLD

Post-transplant lymphoproliferative disorders (PTLDs) are serious, life-threatening complications of transplantation, which represent a heterogeneous group of lymphoproliferative diseases and show a spectrum of clinical, morphologic, and molecular genetic features ranging from reactive polyclonal lesions to frank lymphomas. Polymorphic(P) PTLD are composed of immunoblasts, plasma cells and small and intermediate-sized lymphoid cells that efface the architecture of lymph nodes or form destructiv

Primary DLBCL of the central nervous system (CNS)

Primary DLBCL of the central nervous system (DLBCL-CNS) is an aggressive B-cell neoplasm due in part to the intra-cerebral and/or intra-ocular location, and because a high percentage of cases are in the activated B cell like (ABC) subtype. Lymphoproliferative diseases of the central nervous system are rare, diagnostics and treatment are accordingly challenging. The special localization is related with a series of newly recognized genetic, genomic and immunologic features directing to the stron