Abstract
INTRODUCTION: Primary breast malignancy in adolescent women is very rare and differs in several aspects from findings in adult women. CASE PRESENTATION: A young woman aged 16 years presented with a locally aggressive breast tumor. The patient received cisplatin-based chemotherapy followed by tumor resection assuming a diagnosis of germ cell tumor. Four months later, she developed locally recurrent disease and underwent a mastectomy. No definite diagnosis was agreed upon despite intensive pathological workup. Subsequent management consisted of follow-up only and the patient remains in complete remission 9 years later. CONCLUSION: This case demonstrates the difficulty of diagnosis and management of rare malignancies in adolescents, and highlights the importance of international and interdisciplinary collaboration in diagnosis and clinical decision-making.