Usefulness of ultrasound in the diagnosis and follow-up of pyoderma gangrenosum.

1. Mark RJ, Poen JC, Tran LM, Fu YS, Juillard GF. Angiosarcoma. A report of 67 patients and a review of the literature. Cancer. 1996;77:2400--6. 2. Mentzel T, Kutzner H, Wollina U. Cutaneous angiosarcoma of the face: clinicopathologic and immunohistochemical study of a case resembling rosacea clinically. J Am Acad Dermatol. 1998;38:837--40. 3. Choi WT, Stetsenko GY, Zhang J, Olerud JE, Argenyi ZB, George E. Cutaneous angiosarcoma clinically presenting as progressive solid facial edema in a 43-year-old male. Dermatol Online J. 2013;19:14. 4. Dettenborn T, Wermker K, Schulze H-J, Klein M, Schwipper V, Hallermann C. Prognostic features in angiosarcoma of the head and neck: A retrospective monocenter study. J Craniomaxillofac Surg. 2014;42:1623--8. 5. Shin JY, Roh S-G, Lee N-H, Yang K-M. Predisposing factors for poor prognosis of angiosarcoma of the scalp and face: Systematic review and meta-analysis. Head Neck. 2016;39: 380-6. 6. Abraham JA, Hornicek FJ, Kaufman AM, Harmon DC, Springfield DS, Raskin KA, et al. Treatment and outcome of 82 patients with angiosarcoma. Ann Surg Oncol. 2007;14:1953--67. 7. De Troya Martín M, Alfageme Roldán F. Ecografía dermatológica: una nueva aproximación al conocimiento de la piel. Actas Dermosifiliogr. 2015;106:1--106. 8. Alfageme Roldán F, Salgüero Fernández I, Zamanta Muñoz Garza F, Roustán Gullón G. Actualización en ecografía de las anomalías vasculares. Actas Dermosifiliogr. 2016;107:284--93.