Cytological diagnosis of extramedullary hematopoiesis-presenting as mass-like lesion: A study of four cases
Journal Title: Medpulse International Journal of Pathology - Year 2018, Vol 5, Issue 3
Abstract
Extramedullary hematopoiesis (EMH) is defined as hematopoiesis occurring in organs outside the bone marrow; it occurs in diverse conditions, including fetal development, normal immune responses, and pathological circumstances1. EMH occurs either actively or passively in response to diverse changes in the hematopoietic environment. Both active and passive EMH produce blood cells such as antigen-presenting cells, granulocytes, NK cells, red blood cells, and/or platelets for the growth or survival of the host. EMH sites in adults are most commonly liver, spleen, and lymph nodes2. Objectives: Because of a few nonspecific or occasional lack of clinical signs associated with EMH and its occurrence in almost every organ system and its presentation as a mass-like lesion, recognition of benign trilinear hematopoiesis from aspirations of mass lesions from any site is an important consideration. Case Details: We present four cases of EMH, wherein two of our cases presented with an adrenal mass, which was diagnosed to be myelolipoma and the other two cases were diagnosed incidentally, and further workup of these cases were found to have an underlying hematological disorder. Our cases were subjected to fine needle aspiration cytology (FNAC) under guidance and along with detailed clinical and haematological workup were diagnosed to be EMH. Conclusions: While the bone marrow is the major site of hematopoiesis, it can occur in almost any other tissue of the body. Typical cytomorphology associated with clinical and radiological findings offer a reliable diagnosis of EMH by FNAC.
Authors and Affiliations
Malathi M, Ashwini Naragund, Baalu S, Akkamahadevi Patil
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