Thoracic splenosis is a rare condition including autotransplantation of splenic tissue into the left hemithorax and resulting from simultaneous rupture of the spleen and left hemidiaphragm. In this article, we report a 61-yearold female patient examined due to back pain and who was found to have left pleural nodules in her chest X-ray and computed tomography which were considered to be malignant. Patient had a history of traumatic spleen and left diaphragm rupture. Video assisted thoracoscopic biopsy of the nodules was performed and histological examination confirmed the nodules as splenic tissue. Thoracic splenosis is a pathology which should be kept in mind in patients having a left solitary pleural nodule or multiple pleural nodules and a history of spleen and left diaphragm rupture.