Objective : To demonstrate successful laparoscopic management of a rare case of a large mucinous cystadenoma in 14yr old girl. Design : A single case study of a rare case. Material & Methods : An unmarried 14 yrs old female presented with c/o pain in abdomen & abdominal distension for 15days. On examination- A smooth and firm mass, 28 x 30 week size presentarising from the pelvis Ultrasound revealed a very large 25 x 20 cms cystic mass lesion with internal septations arising from pelvis - large ovarian cystic mass with rt. hydronephrosis . Plain & contrast CT & MRI confirmed the findings. CA 125, CEA & routine investigations are in normal range. Patient was taken up for laparoscopic Lt.