A histiocytic twist in a tale of GIST

Abstract

Histiocytic sarcoma (HS) is a rare, non-Langerhan’s, malignant histiocytic neoplasm that occurs in lymph nodes and extranodal sites mainly the skin and intestine. Amidst the cases reported so far; majority of the cases previously diagnosed as HS have been Primary T cell lymphomas (PTCL). Cases primarily involving the extranodal sites are rare, with a confusing clinical picture and thus, are often misdiagnosed. Here we report a rare case of extranodal HS in a 54-year-old man, a previously treated case of gastrointestinal stromal tumor (GIST) of the stomach, who now presented with abdominal pain. On imaging, a growth was detected in the small bowel without accompanying lymphadenopathy.