Elevated serum levels of alkaline phosphatase (in the presence of liver metastases
Barium swallow for the detection of angulation of a long axis of the esophagus, narrowing of the lumen at the site of the lesion, proximal dilatation of the lumen
Chest X ray for the detection of pulmonary metastases
Thoracoscopy
C.T. scan of chest & abdomen
M.R.I. for the detection of distant metastases
Esophagoscopy with biopsy
Brush cytology
Endoscopic ultrasound
Bone scans for the detection ofl bony metastases