An ostomy appliance (10) comprising: two opposite panels (12, 14) comprising a front panel (12) and a rear panel (14), at least partially sealed together along their peripheries, wherein said panels (12, 14) form a bag (18) to capture body waste, in which one of said opposite panels (12, 14) has a stomatal opening (20) to be placed around a stoma so that the body waste that are excreted through the stoma are captured in said bag (18), in which said bag (18) has a filter (22) for deodorizing odorous gas from bodily waste and an opening to emit said deodorized gas into the atmosphere and a pleated central panel (28) between said two opposite panels (12, 14) that at least partially covers said filter (22) to protect said filter (22) and to prevent the formation of bulges in said bag (18) due to the accumulation of gas in said bag (18). characterized in that the pleated center panel (28) has a partially free edge portion (32) that is intermittently attached to an inner surface of the front panel (12) in a way that produces extra material in the form of folds, wrinkles or folds.Un aparato de ostomía (10) que comprende: dos paneles opuestos (12, 14) que comprenden un panel frontal (12) y un panel posterior (14), al menos parcialmente sellados entre sí a lo largo de sus periferias, en que dichos paneles (12, 14) forman una bolsa (18) para capturar desechos corporales, en que uno de dichos paneles opuestos (12, 14) tiene una abertura estomática (20) para ser colocada alrededor de un estoma de modo que los residuos corporales que se excretan a través del estoma se capturan en dicha bolsa (18), en que dicha bolsa (18) tiene un filtro (22) para la desodorización del gas oloroso de los desechos corporales y una abertura para emitir dicho gas desodorizado a la atmósfera y un panel central plisado (28) entre dichos dos paneles opuestos (12, 14) que cubre al menos parcialmente dicho filtro (22) para proteger dicho filtro (22) y para evitar la formación de abombamientos en dicha bo
