da Silva Pinto, D. ., A. C. . Moraes Paro, D. Yuji Tanaka, A. C. Oliveira Johnen, P. . Guimenti Ribeiro de Lima, I. Dias Muniz de Andrade, A. . Regina de Souza Marini, H. P. Schleinstein, and J. K. de Gentile. “Pneumoperitoneum, Retropneumoperitoneum and Pneumomediastinum After Stapled Hemorrhoidopexy”. Brazilian Journal of Case Reports, vol. 2, no. 4, Sept. 2022, pp. 33-40, doi:10.52600/2763-583X.bjcr.2022.2.4.33-40.