The Triad of Frailty, Tumor Neglect, and Operative Burden in Extensive Scalp Reconstruction: A 10-Year Experience with Rare Diagnoses

Abstract BACKGROUND Elderly, debilitated patients are increasingly challenged by advanced, untreated scalp cancers presenting with significant tumor burdens, physical frailty, and demanding reconstructive needs. Surgeons face the difficult balance of providing curatively radical surgery while managing the physiological constraints of these vulnerable individuals. METHODS We performed a retrospective review of 34 patients with extensive neglected scalp malignancies (defect > 50 cm 2 ) treated surgically between 2015–2025. Preoperative frailty was evaluated using the modified Frailty Index-5 (mFI-5). Overall Surgical Oncologic Clearance (OSOC) was determined via multidisciplinary consensus incorporating intraoperative visualization, frozen sections, and final pathology. Reconstructive plans were individualized, prioritizing extended local or regional flaps and avoiding free tissue transfer when oncological and technically feasible. Survival was analyzed using Kaplan-Meier estimates and log-rank tests. A ridge-penalized Cox Proportional Hazards Model, validated by two independent statistical methodologies, was utilized to identify independent predictors of disease-specific mortality. RESULTS Twenty-seven (79%) patients had NMSCs (21 SCC, 6 BCC). Most of these patients were highly frail (mean mFI-5 = 2.8 ± 0.8). Disease-specific mortality was significantly higher following unsuccessful OSOC compared to successful OSOC (80% vs. 4.5%, p = 0.001). Achieving successful OSOC remained independently associated with improved survival, even after accounting for frailty and operative burden (HR = 0.25; 95% CI 0.06–1.00; p = 0.05). Utilizing extended local and regional flaps successfully closed massive defects up to 251.2 cm2 without increasing the rates of failed OSOC compared to free flap reconstruction (81.8% vs. 80%, p = 1.0). The remaining seven patients presented with rare, difficult-to-diagnose pathologies including proliferating trichilemmal tumor, dermatofibrosarcoma protuberans, pilomatrixal carcinoma, malignant melanoma, hidradenocarcinoma, and syringocystadenocarcinoma papilliferum. CONCLUSIONS Complete oncologic clearance, rather than frailty status alone, remains the most important factor determining disease-specific survival in patients with neglected scalp malignancies. Furthermore, extending the reconstructive ladder to favor larger local and regional flaps reduces operative burden without decreasing the success rates of oncologic clearance. Therefore, a curative-intent approach is advocated for frail geriatric patients, provided the reconstructive strategy minimizes operative risk. Finally, large, atypical masses with indeterminate initial biopsies warrant particular caution, as non-diagnostic results may obscure aggressive rare pathologies.