Quiste tímico inusual de mediastino posterior en un paciente con neurofibromatosis

. Thymus tumors are the most frequent in the anterior mediastinum. Congenital mediastinal cysts occur 3 to 6%. Their posterior location is extremely rare, and therefore the clinic that accompanies them; however, it should be considered among the differential diagnoses, as is the case in the case presented below in a patient with a history of neurofibromatosis in a reference institute. This is a 53-year-old woman with a posterior mediastinal cyst, undergoing thoracotomy resection, which in the definitive pathology study was a thymic cyst, with good results and with follow-up without recurrence.