MEEGADA, S. R.; ALAPATI, K. V.; VARUGHESE, M. Importance of high-frequency and low-frequency three-dimensional endoanal ultrasound scan in diagnosing perianal fistula and abscess. International Surgery Journal, [S. l.], v. 11, n. 6, p. 908–917, 2024. DOI: 10.18203/2349-2902.isj20241389. Disponível em: https://www.ijsurgery.com/index.php/isj/article/view/10160. Acesso em: 10 nov. 2025.