Fig. 16
From: Tumor and tumorlike conditions of the pleura and juxtapleural region: review of imaging findings
Diagnosis: benign schwannoma with low mitotic activity. Technique: standard chest radiography, contrast-enhanced chest CT and MRI. Description: A 55-year-old man with respiratory distress was transferred to our hospital after drainage of a hemothorax. The antero-posterior chest radiograph (a) shows a large mass in the left lung with a perilesional rim of air (due to pneumothorax). On contrast-enhanced CT (b) the homogeneous hypointense mass is located paravertebral in the left lower lobe with vertebral scalloping (arrow on c). There are no intralesional calcifications or necrosis. Note also the adjacent consolidation due to atelectasis. On the axial T2 FS WI MR image (d), the lesion has a high signal intensity and is relatively enhancing after contrast administration (e). Based on imaging findings and the size of the lesion, a malignant nerve sheath tumor was suggested. Histopathologic examination of the resected mass, however, did not reveal signs of malignancy but showed an 11-cm large benign schwannoma with low mitotic activity. Genetic counseling for NF-1 was negative