Approaches to the Diagnosis and Management of Paediatric Ovarian Tumours and Oncological Outcomes in a Single-centre Study. Evidence in Support Of IPSO Reccomendations.
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BACKGROUND: Approaches to paediatric ovarian tumours vary. Cross-sectional imaging is reliable but not always performed. Laparoscopic tumourectomy, although popular, is not recommended by International Paediatric Surgical Oncology Society (IPSO); tumour spillage remains the main concern. We aimed to investigate the reliability of preoperative evaluation and identify perioperative factors associated with adverse outcomes. METHODS: Single-centre retrospective study (2015-2022) of clinical presentation, preoperative investigation, operative approaches and oncological outcomes in all females <18 years treated for ovarian tumours. Logistic regression was used to identify predictors of malignancy and of second disease events. Data are presented as median (IQR) or rates. RESULTS: Sixty girls aged 12.5 (10-15) years with follow-up of 51 (30.5-76.3) months were included. Incidence of malignant and low malignant potential tumours was 19/60 (32%). Tumour size and consistency proved predictive of malignancy. Clinical assessement, tumour markers and cross-sectional imaging combined showed 75% sensitivity, 100% specificity and 7% misclassified malignancy rate. Second disease events (11/60, 18%) were associated with misclassified malignancy (2/11 vs. 1/49, p = 0.04) and positive margins (4/11 vs. 5/49, p = 0.02). Ovarian-sparing surgery did not influence second events (5/11 vs. 28/49, p = 0.48). There was no significant association between second events and laparoscopic tumourectomy (3/11 vs. 20/49, p = 0.40); spillage rate was however more frequent with laparoscopy (5/11 vs. 2/32, p = 0.008). CONCLUSION: Misclassified malignancy, noted in 7% of patients undergoing optimal work-up, adversely impacted outcomes, highlighting the importance of oncological principles in both oophorectomy and ovarian-sparing surgery. Malignancy incidence and misclassification can be underestimated when tumours with malignant behaviour potential, such as immature teratomas and borderline tumours, are grouped as benign. There was no direct association between operative approaches and second events. Laparoscopy, however, failed to maintain oncological principles more frequently than open surgery and hence risks upstaging of paediatric ovarian pathology. LEVEL OF EVIDENCE: III.