Late-onset multiple acyl-CoA dehydrogenase deficiency with breast cancer

Background Multiple acyl-CoA dehydrogenase deficiency (MAAD) is a rare metabolic disorder resulting from an abnormality in fatty acid oxidation. There are three types of presentations: neonatal onset with or without congenital anomalies and the late-onset type. There is much clinical heterogeneity in the presentation of late-onset variants; hence, the diagnosis is often delayed or missed. Case presentation Here, we report the successful management of a 41-year-old female with late-onset MAAD due to mutation in the ETFDH gene who presented with carcinoma of the breast. Chemotherapy was challenging because there were no previous reports regarding the treatment of such cases. Conclusion The diagnosis was made based on metabolic workup and gene mutation analysis. Unplanned surgery and chemotherapy can be fatal in these patients due to metabolic complications. With proper precautions and monitoring, the patient tolerated surgery and chemotherapy without any complications.