title: Hemophagocytic lymphohistiocytosis: critical reappraisal of a potentially under-recognized condition.
abstract: Hemophagocytic lymphohistiocytosis (HLH) is an uncommon, potentially life threatening, hyper inflammatory syndrome of diverse etiologies. Cardinal signs include prolonged fever, organomegaly, and persistent unexplained cytopenias. In spite of the well known diagnostic criteria put forth by HLH society, this continues to pose great diagnostic challenge in both pediatric and adult intensive care settings. We describe 4 adult (2 males, 2 females, aged 19, 29, 40, and 17 years) and 3 pediatric (2 males, 1 female, aged 1 month, 6 months, and 12 years) patients with secondary HLH who satisfied the HLH-2004 diagnostic criteria. Definite evidence of hemophagocytosis was noted in 4 patients on initial bone marrow examination. The underlying etiologies were as follows: Rickettsia tsutsugamushi (case 1), autoimmune disorder (case 2), systemic onset juvenile idiopathic arthritis (sJIA) (case 3), unknown bite (possibly a venomous snake) (case 4), Plasmodium vivax (case 5), Cytomegalo virus (case 6), and Mycobacterium tuberculosis (case 7). In one patient, hemophagocytosis was presumed to have been exacerbated by administration of granulocyte monocyte colony stimulating factor (GMCSF) for severe neutropenia. Two patients died with disseminated intravascular coagulation (DIC) and multi organ failure within few days of HLH diagnosis. Immunosuppressive therapy was started in 3 patients, and etoposide was started in one patient only. Due to lack of specificity of diagnostic criteria, diagnosing and differentiating HLH from its closest mimickers like sepsis/septic shock may be quite challenging in critically ill patients. Therefore, increasing awareness among physicians is essential for early diagnosis and effective therapy to reduce the mortality.
authors.affiliation: Department of Pathology, Pondicherry Institute of Medical Sciences, Ganapathichettykulam, Kalapet, Puducherry, 605 014, India, somanath.padhi@gmail.com.
authors.forename: Somanath
authors.initials: S
authors.lastname: Padhi
authors.forename: Renu G' Boy
authors.initials: RG
authors.lastname: Varghese
authors.forename: Anita
authors.initials: A
authors.lastname: Ramdas
authors.forename: Manjiri Dilip
authors.initials: MD
authors.lastname: Phansalkar
authors.forename: RajLaxmi
authors.initials: R
authors.lastname: Sarangi
mesh_terms: D000293:Adolescent; D000328:Adult; D002648:Child; D003937:Diagnosis, Differential; D005260:Female; D006801:Humans; D007166:Immunosuppressive Agents / Q000627:therapeutic use; D007223:Infant; D051359:Lymphohistiocytosis, Hemophagocytic / Q000175:diagnosis* / Q000188:drug therapy / Q000209:etiology / Q000401:mortality; D008297:Male; D012772:Shock, Septic / Q000175:diagnosis; D016896:Treatment Outcome
chemical_list: D007166:Immunosuppressive Agents