Esophageal tumor with an unusual histological appearance: a case report. 
An unusual esophageal tumor in a 58-year-old man complaining of dysphagia and weight loss is herein described.  Esophageal radioscopy and endoscopy visualized a huge polypoid tumor which was occluding the esophagus.  After esophageal resection, the histological examination revealed miscellaneous benign cells (squamous, columnar fat cells, cartilaginous cells, and glandular structures) and two different malignant areas (spindler sarcomatous cells and squamous cells).  There was no malignant invasion in the stalk, in the adjacent esophageal wall, or in the periesophageal tissue, and there were no malignant adenopathies.  The postoperative course was favorable for one year, until the patient developed pain in the right superior back.  A sarcomatous relapse was diagnosed by fine-needle biopsy under CT guidance, and the patient subsequently received radiation therapy.