Patient c2; first MRI of the pelvis, 1 day prior to first histology of malignancy: Large, ulcerated, space occupying lesion median/paramedian on both sides gluteally from sacral vertebrae 3 to the pelvic floor, approximately 14 cm × 12 cm × 6 cm in size. Irregular configuration at the margins. Extension of the lesion cutaneously, subcutaneously and muscularly into the adjacent parts of the gluteus maximus, minimus and medius muscles as well as the piriformis muscle and the levator ani muscle. Further extension to the sacrum and the coccyx, which appears destructed. Perifocal edema. Lymph node with contrast medium enrichment at left gluteus. Pathologically enlarged iliac and inguinal lymph nodes bilaterally