Small bowel and lung histiocytic sarcoma revealed by acute peritonitis: A case report with review of literature.

INTRODUCTION AND

IMPORTANCE

Histiocytic sarcoma (HS) is a rare malignant neoplasm showing morphologic and immunohistochemical features of histiocytes. It is characterized typically by extranodal presentation and a poor clinical course, particularly in cases with disseminated disease.

CASE PRESENTATION: This report documents a case of bifocal and aggressive HS in small bowel and lung revealed by acute peritonitis in a 63-year-old man.

CLINICAL DISCUSSION: Despite its rarity, we believe that the correct diagnosis of HS is crucial for clinical treatment and prognostic prediction.

CONCLUSION

The collection of additional cases of HS are important to obtain further progress in prognosis and guide treatment decisions.