PMC4038829_01
Axial CT images, revealing a small mass almost 5 mm in diameter at the left wall of the nasopharynx.
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F1
Computed tomography (CT) without contrast enhancement showed a mass almost 5 mm in diameter at the left wall of the nasopharynx (Figure  1).
Gross examination of the excised specimen, showing an oval lesion with smooth surface.
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F2
The mass was excised by trans-nasal endoscopic surgery under general anesthesia (Figure  2).
Pathological features of the specimen, showing interlacing bundles of smooth muscles (Hematoxylin and Eosin; 400x).
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F3
Pathologic examination showed cells with the mature phenotype of smooth muscle, but arranged haphazardly (Figure  3).
The histopathological study of leiomyomatous hamartoma in immune-histochemical stain (bar; 100 mum). A: Positive reaction with smooth muscle actin in the muscle bundles. B: Positive reaction with desmin in the muscle bundles (arrow), but negative in the nerve. C: Positive reaction with S-100 protein in the nerve (arrow), but negative in smooth muscle bundles.
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F4
Immunoreaction were clearly positive in smooth muscle cells fascicles (Figure  4A and B) (positive immunoreactions for smooth muscle actin and desmin) and nervous tissue (Figure  4C) (positive immunoreaction for S-100).