This patient has a medical history of cough and grades III gastroesophageal reflux. At the time of its evaluation, the use of intercostal and subcostal muscles was identified auscultating a diminished vesicular murmur with the right predominance.

When performing a chest X-ray, a hyperdense image with an oval tendency was observed with no evidence of air bronchogram and because the treating service did not coincide, it decided the complement which showed of a mass visualized in the right lung, was a kidney.

Renal intrathoracic ectopia denotes a complete or partial protrusion of the kidney above the level diaphragm into the posterior mediastinum. It is more common in men than in women. It is generally asymptomatic but, those with gestational cough could be misdiagnosed as a mass or pleural effusion on chest radiographs as in the case of the patient.

Ectopic kidney may be pelvic, iliac, thoracic, contralateral or crossed. Initially located in the pelvis, they migrate cranially such that by the third month they are at the level of the L2 vertebra and meet the suprarenal glands.