Whole-body PET/MRI: the effect of bone attenuation during MR-based attenuation correction in oncology imaging.

Purpose: In combined PET/MRI standard PET attenuation correction (AC) is based on tissue segmentation following dedicated MR sequencing and, typically, bone tissue is not represented. We evaluate PET quantification in whole-body (WB)-PET/MRI following MR-AC without considering bone attenuation and then investigate different strategies to account for bone tissue in clinical PET/MR imaging. To this purpose, bone tissue representation was extracted from separate CT images, and different bone representations were simulated from hypothetically derived MR-based bone classifications.

Long-term observation following perforation and rupture of the esophagus.

A follow-up study of 35 patients was performed 1.5 to 22 years after simple closure and drainage of the esophagus for nonmalignant intrathoracic perforation or rupture, with special attention to dysphagia. Of the seven patients with spontaneous rupture, only one required supplementary postoperative treatment, for severe reflux esophagitis.

Teratomas of the mediastinum.

Mediastinal teratomas are rare, constituting only 8-13% of tumours in this region. Teratomas often contain structures from all three germ layers, and 15-20% are malignant. A report is presented of eight patients operated on in 1978-1985 for mediastinal teratoma histologically classified as benign.