Bok-Kyung Sohn, et al. world-wide [3]. Clinical symptoms of cystic lymphangioma found in- side the abdominal cavity, if present, vary from no symp- toms to a variety of symptoms depending on the location and size of the mass. More acute cases are reported in chil- dren whereas more chronic development is common among adults [1]. Features of pancreatic cystic lym- phangioma normally involve abdominal pain and the presence of a mass confirmed by tactile examination. In this case, the patient was a female who complained of a chronic condition of abdominal mass with rapidly grow- ing, of which the cause was later confirmed as pancreatic cystic lymphangioma Diseases requiring particular attention to accurate diag- nosis include: pancreatic pseudocyst, mucinous cystade- noma, serous cystadenoma, cystic carcinoma of the Wir- sung’s Duct, and congenital neoplasms [5]. To ensure dis- Fig. 6. Immunohistochemical stain. The lining endothelial cells show strong immunopositivity for CD31 and D2-40 and weak positivity for CD34 (Immunohistochemistry, ×200). tinction between cystic lymphangioma and the afore- mentioned conditions, diagnostic tools such as plain ab- dominal films, abdominal CT, and magnetic resonance imaging (MRI) may be utilized. Plain abdominal X-rays may reveal dislocation or blockage of the intestines, and CT and MRI could help determine the pre-operational lo- cation of the mass, the relationship between the mass and its surrounding structures, the size of the mass, and likely complications of surgery. However, these tests do not guarantee a completely accurate diagnosis. It is still con- sidered a difficult task to accurately diagnose pancreatic cystic lymphangioma prior to a surgical procedure [3,6,7]. Although normally considered benign, cystic lym- phangiomas can continue to increase in size, infiltrate the neighboring organs, and pose risks for complications such as leakage of lymphatic fluids and recurrence. If the in- filtrated organs are excisable, they must also be removed 144 thesurgery.or.kr