PMC4955461_01
Computed Tomography showing a right posterior mediastinal cyst adjacent to the oesophagus (white arrow) (original)
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F1
The patient was referred to paediatric surgery and a contrasted CT of the chest revealed a discrete 2.6 cm x 2.3 cm right posterior mediastinal cyst adjacent to the oesophagus, most likely representing a foregut duplication cyst [Figure 1].
Foregut duplication cyst prior to enucleation (original)
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F2
In the operating room (OR), the cyst was dissected bluntly from within the muscular layer of the oesophagus [Figure 2].
Cross-section of foregut cyst wall showing respiratory epithelium (right) with underlying smooth muscle and fibroconnective tissue serosa in the absence of seromucinous glands or cartilaginous plates (H and E, x40). Inset: Ciliated respiratory epithelium with focal mucus secretion (H and E, x400) (original)
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F3
Histologic features included a respiratory epithelial lining and underlying smooth muscle [Figure 3].
Contrast swallow study showing outpouching of the distal oesophagus representing a pseudodiverticulum (white arrow) (original)
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F4
An upper gastrointestinal contrast evaluation with barium revealed an outpouching of the distal oesophagus at the site of cyst excision, suggesting the development of an oesophageal diverticulum or pseudodiverticulum [Figure 4].