When two benign ovarian pathologies collide: an incidental bilateral collision tumour of mature cystic teratoma and endometrioma

Ovarian collision tumours are rare pathological entities, and presentations involving histologically distinct tumours in different ovaries are extremely uncommon.This case adds to the limited literature by illustrating an atypical and largely incidental presentation with non-specific symptoms.Such variability in clinical and radiologic presentation underscores the diagnostic complexity of these tumours and the potential for under-recognition.Although advanced imaging, particularly MRI, may provide important diagnostic clues, definitive diagnosis relies on a comprehensive histopathological assessment.Awareness of this unusual presentation is crucial, as early recognition of bilateral but distinct ovarian tumours can influence surgical planning, fertility-preserving strategies and follow-up, ultimately improving individualised patient care.