case_images: PMC4038829_01
case_images: Axial CT images, revealing a small mass almost 5 mm in diameter at the left wall of the nasopharynx.
case_images: 1472-6815-14-5-1.jpg
case_images: PMC4038829_01_1472-6815-14-5-1.jpg
case_images: F1
case_images: Computed tomography (CT) without contrast enhancement showed a mass almost 5 mm in diameter at the left wall of the nasopharynx (Figure  1).
case_images: Gross examination of the excised specimen, showing an oval lesion with smooth surface.
case_images: 1472-6815-14-5-2.jpg
case_images: PMC4038829_01_1472-6815-14-5-2.jpg
case_images: F2
case_images: The mass was excised by trans-nasal endoscopic surgery under general anesthesia (Figure  2).
case_images: Pathological features of the specimen, showing interlacing bundles of smooth muscles (Hematoxylin and Eosin; 400x).
case_images: 1472-6815-14-5-3.jpg
case_images: PMC4038829_01_1472-6815-14-5-3.jpg
case_images: F3
case_images: Pathologic examination showed cells with the mature phenotype of smooth muscle, but arranged haphazardly (Figure  3).
case_images: 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.
case_images: 1472-6815-14-5-4.jpg
case_images: PMC4038829_01_1472-6815-14-5-4.jpg
case_images: F4
case_images: 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).