if data["left_present"]:
            self.run_validators_on_field(data, "left_type", [required()])
            self.run_validators_on_field(data, "left_cysts", [required()])
            self.run_validators_on_field(data, "left_stones", [required()])
            self.run_validators_on_field(data, "left_calcification", [required()])