May ulcerate with gas ± contrast medium entering cavity
• CT: Discrete mass in wall; no signs of invasion or metastases
Helps distinguish lipoma (fat density) and other mediastinal masses (e.g., mediastinal cyst)
TOP DIFFERENTIAL DIAGNOSES
• Mediastinal tumor
• Normal mediastinal structures
• Esophageal carcinoma
• Foreign body
CLINICAL ISSUES
• Asymptomatic: No treatment
• Large, symptomatic lesions: Enucleation or esophageal resection with gastric interposition
DIAGNOSTIC CHECKLIST
• Most intramural masses are benign (unlike gastric tumors)
• Leiomyomas are much more common than GIST in esophagus (but not in stomach)
• Calcifications suggest leiomyoma; almost never occur in other benign/malignant esophageal tumors
(Left) Film from a barium esophagram demonstrates a mass causing eccentric narrowing of the distal lumen. The mass forms obtuse angles with the wall, and the esophageal folds and mucosa are intact. A leiomyoma was enucleated endoscopically.
(Right) Single-contrast esophagram shows an en face view of an intramural mass in the distal esophagus with central ulceration due to leiomyoma. The traction diverticulum is an incidental finding.
(Left) Coronal CECT in a 24-year-old man shows a huge, soft tissue density mass that envelops and displaces the distal esophagus . Small foci of calcification are noted. The mass was resected and proved to be a benign leiomyoma arising from the esophageal wall.
(Right) Axial CECT in a 73-year-old woman shows a huge esophageal mass with a large central ulceration that contains gas due to communication with the esophageal lumen. The central cavitation is typical of a GIST; the esophagus is an unusual site.
TERMINOLOGY
Definitions
• Benign mass composed of 1 or more tissue elements of esophageal wall
IMAGING
General Features
• Best diagnostic clue
Intramural mass with smooth surface and slightly obtuse borders on barium esophagram
• Size
1 cm to > 10 cm
• Other
Types include leiomyoma, GI stromal tumor, granular cell, lipoma, hemangioma, hamartoma
Radiographic Findings
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Smooth surface lesion, with upper and lower borders of lesion forming right or slightly obtuse angles with adjacent esophageal wall (profile view)
causing eccentric narrowing of the distal lumen. The mass forms obtuse angles with the wall, and the esophageal folds and mucosa are intact. A leiomyoma was enucleated endoscopically.
due to leiomyoma. The traction diverticulum 
is an incidental finding.
. Small foci of calcification 
are noted. The mass was resected and proved to be a benign leiomyoma arising from the esophageal wall.
with a large central ulceration 
that contains gas due to communication with the esophageal lumen. The central cavitation is typical of a GIST; the esophagus is an unusual site.
