Conclusion:
This case report highlights a rare but significant complication of a
large mature cystic teratoma leading to ureterohydronephrosis,
pyelocalyceal rupture, and urinoma in an adult woman. Our findings
emphasize the critical role of imaging for early diagnosis and the
necessity for prompt surgical intervention. The case serves as a
cautionary tale that even benign ovarian neoplasms like teratomas can
cause severe complications requiring multidisciplinary management.