title: Perivascular Ki-1 + lesions.
abstract: We describe three male patients diagnosed by histologic and immunophenotypic criteria to have a Ki-1 + lymphoproliferative disorder. All three cases shared a unique morphologic finding, not previously described: prominent perivascular cuffing of anaplastic/pleomorphic tumor cells around small and medium sized vessels. One case was a Ki-1 + anaplastic large cell lymphoma (ALCL) which developed in the setting of a low grade follicular B-cell lymphoma. A pseudoglandular pattern caused referral for consultation as a possible adenocarcinoma. One case was a cutaneous Ki-1 + lymphoproliferative disorder consistent with lymphomatoid papulosis (LyP). The third case was a cutaneous Ki-1 + ALCL. This study provides evidence that although perivascular cuffing of tumor cells is not frequently seen in Ki-1 + lymphoproliferative disorders (3 of 116 cases in our consultation file), it may be a prominent architectural feature causing confusion with epithelial or mesenchymal tumors. For this reason we recommend inclusion of this feature in the list of architectural features already described for Ki-1 + lymphoproliferative disorders.
authors.affiliation: Department of Pathology, Beth Israel Hospital, Boston, MA 02215.
authors.forename: N
authors.initials: N
authors.lastname: Sioutos
authors.forename: M E
authors.initials: ME
authors.lastname: Kadin
mesh_terms: D000328:Adult; D000368:Aged; D000951:Antigens, Neoplasm / Q000032:analysis; D014408:Biomarkers, Tumor / Q000032:analysis; D001808:Blood Vessels / Q000473:pathology*; D002448:Cell Adhesion; D002648:Child; D004730:Endothelium, Vascular / Q000378:metabolism; D006689:Hodgkin Disease / Q000473:pathology; D006801:Humans; D016169:Lymphocyte Function-Associated Antigen-1 / Q000378:metabolism; D016393:Lymphoma, B-Cell / Q000473:pathology; D008224:Lymphoma, Follicular / Q000473:pathology; D016403:Lymphoma, Large B-Cell, Diffuse / Q000737:chemistry / Q000473:pathology*; D008297:Male; D009363:Neoplasm Proteins / Q000032:analysis; D009378:Neoplasms, Multiple Primary / Q000473:pathology
chemical_list: D000951:Antigens, Neoplasm; D014408:Biomarkers, Tumor; D016169:Lymphocyte Function-Associated Antigen-1; D009363:Neoplasm Proteins