Interdigitating Dendritic Cell Tumour: A Rare Case Report with Review of Literature

Background and Aims: Interdigitating dendritic cell tumour/sarcoma (IDCS) is an exceedingly uncommon and aggressive tumour with a dismal prognosis. IDCS arises from antigen-presenting cells, which involve nodal and extranodal sites. The aim of the study is to evaluate a case of IDCS and its diagnostic challenges. Methods: A 21-year-old female with no comorbidities, a bone marrow aspirate and biopsy and an excision biopsy of the lymph node shows atypical mononuclear infiltrates that were immunohistochemically positive for S100-diffuse, CD68, LCA and Ki67. Results: Here, we report a single case of IDCS with a tumour arising from the lymph node and bone marrow infiltration. Discussion: IDCS is an aggressive disease with uncertain behaviour; strong suspicion is required to establish a diagnosis.