Ravishankar, K. S., and A. M. Subramanian. “Hobnail Variety of Papillary Cell Carcinoma Thyroid Mimicking a Thyroglossal Cyst: A Rare Presentation”. International Surgery Journal, vol. 6, no. 6, May 2019, pp. 2198-00, doi:10.18203/2349-2902.isj20192392.