Pulmonary choristoma associated with calf meningocele

ABSTRACT

Pulmonary choristoma is a rare malformation reported in different animal species defined as a mass of normal histological pulmonary tissue in an abnormal location. A case of pulmonary choristoma and meningocele is reported in a calf that presented a fluctuating subcutaneous fluid containing mass, measuring 15 x 15 x 20cm in the skull frontal region. The skin covering the sac was surgically removed. Macroscopically, subcutaneous nodules up to 2cm in diameter with irregular whitish areas mixed with red areas were observed. In the histological examination, pulmonary lobules tissue composed by alveoli, bronchi, bronchioles and cartilage were observed. Dilated blood vessels and hemorrhages were present between the lobules. In this case the pulmonary choristoma was associated with meningocele, and probably was the mechanical cause for the failure of the skull closure.

RESUMO

Coristoma pulmonar é uma malformação rara, reportada em diferentes espécies animais. Este trabalho descreve um caso de coristoma pulmonar associado à meningocele em uma bezerra. O animal apresentava uma massa flutuante contendo transudato e medindo 15 x 15 x 20cm na região frontal do crânio. A pele que formava o saco cheio de líquido foi removida cirurgicamente. Por baixo da pele observavam-se nódulos subcutâneos de até 2cm, irregulares e com áreas esbranquiçadas entremeadas com áreas vermelhas. Na microscopia, observaram-se lóbulos de tecido pulmonar compostos por alvéolos, bronquíolos, brônquios e cartilagem. Nesse caso, o coristoma pulmonar estava associado à meningocele, e provavelmente foi a causa mecânica do não fechamento do crânio.