adenomatoid pleural tumor introduction: Adenomatoid tumors are rare benign neoplasms, pleural is a very rare location, reporting only 4 cases worldwide and none in our country. case report: A 30 year-old female patient, that in the context of a preventive health examination, presents a mediastinal solid mass in the right hemithorax, in the thorax radiography. The lesion of 8 cm x 7 cm x 2.4 cm was surgically removed. Histology shows a lesion compatible with pleural adenomatoid tumor and inmunohistochemistry is positive for markers such as calretinin and cytokeratin 5/6. discussion: The pleural adenomatoid tumor is an uncommon neoplasm with benign behavior and several differential diagnoses.