[Recurrent thrombosed external hemorrhoids due to L-asparaginase administration in a Philadelphia chromosome-positive acute lymphoblastic leukemia patient].

A 13-year-old female developed L-asparaginase (L-ASP) -associated thrombosed external hemorrhoids (TEH) during chemotherapy for Philadelphia chromosome-positive acute lymphoblastic leukemia. While undergoing induction therapy combined with imatinib, she experienced intense anal pain a day after the four-time administration of L-ASP. The anal verge contained painful bluish hemorrhoids, which reportedly were absent before the therapy commencement. Hemorrhoids occurred 5-9 days after every L-ASP treatment, which was eventually diagnosed as L-ASP-associated TEH. After the failure of conservative treatment, opioid therapy was initiated. During myeloid reconstitution, she underwent divided ligation of hemorrhoids; however, the hemorrhoids became necrotic and formed an ulcerated tissue bed. This case suggests that while undertaking L-ASP therapy in adolescents and young adults with acute lymphoblastic leukemia, physicians should monitor signs of hemorrhoids and consider divided ligation when appropriate.