• Lymphangiomas are rare cystic tumors of the lymphatic system. They are benign, slow growing lesions characterized by proliferating lymphatic vessels. They most commonly affect neck and axilla (90%). Intraabdominal cases are rare (5%) and retroperitoneal cases are very rare (1% only) • A 24 years old female presented with right abdominal pain and investigated for same. CECT A+P suggesting retroperitoneal lymphangioma or mesothelioma. Cytology s/o lymphangioma. Surgical exploration done and excision of retroperitoneal cyst done.