The association of colorectal cancer with ulcerative colitis (UC) is well-recognized. However, not much is known regarding the increased risk of extra-intestinal malignancies with UC. Several studies have revealed that patients with UC are at in-creased risk of hepatobiliary cancer, nonmelanoma skin cancer, and myeloid leukemia. A 41-year-old man was diagnosed with UC in 1993 and had three relapses over the next three years. Six months after the fourth remission, he developed pan-cytopenia and was diagnosed with acute promyelocytic leukemia (APL). He achieved complete remissions of APL through chemotherapies, and, since then, no recurrences of APL and UC were observed.

• 신광식(국립경찰병원 내과) | Kwang Sik Shin
• 서승오(국립경찰병원 내과) | Seong O Suh Corresponding author
• 김소연(국립경찰병원 내과) | Soyon Kim
• 정준오(국립경찰병원 내과) | Jun Oh Jung
• 유지원(국립경찰병원 내과) | Ji Won Yoo
• 신동환(국립경찰병원 내과) | Dong Hwan Shin
• 백주영(국립경찰병원 내과) | Joo Yeong Baeg
• 이경인(국립경찰병원 진단검사의학과) | Gyeong In Lee