Spheric Mass Beneath the Alar Base: MR Images of Nasolabial Cyst and Schwannoma
S. Iidaa,
T. Aikawaa,
M. Kishinob,
T. Sakaia,
Y. Nakanoa,
M. Okuraa and
M. Kogoa
a The First Department of Oral and Maxillofacial Surgery, Osaka University Graduate School of Dentistry, Osaka, Japan
b Department of Oral Pathology, Osaka University Graduate School of Dentistry, Osaka, Japan
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Fig 1. Nasolabial cyst (case 1).
A, The axial T1-weighted image shows the lesion beneath the left alar base with a well-circumscribed homogeneous isointensity containing a sedimentation level.
B, The axial T2-weighted image shows the homogeneous hyperintensive lesion, in which the sedimentation level is also observed.
C, The coronal T2-weighted image shows a bean-shaped homogeneous hyperintensive lesion, which does not expand toward the nasal side but instead expands toward the lateral side.
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Fig 2. Nasolabial cyst (case 2).
A, The axial T1-weighted image shows the well-circumscribed lesion with a homogeneous isointensity in the anterior nasal fold.
B, The axial T2-weighted image shows the well-circumscribed lesion with a homogeneous hyperintensity.
C, The coronal T2-weighted MR image shows the lesion extending toward the nasal cavity along the lateral nasal wall.
D, The sagittal T2-weighted MR image shows the expansion of the lesion toward the posterior of the nasal cavity, and the lesion appears as a bean shape because of the anterior edge of the nasal base of the maxillary bone.
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Fig 3. Schwannoma (case 3).
A, The axial T1-weighted image shows the rounded well-circumscribed lesion beneath the right alar base.
B, The axial T2-weighted images reveals the presence of a homogeneous well-circumscribed rounded lesion beneath the right alar base. The lesion is not attached to the nasal structures.
C, The excised specimen shows that the tumor consists of a yellowish jellylike mass encapsulated by thin fibrous tissue.
D, Histopathologically, the tumor is composed of proliferating spindle-shaped cells showing a palisaded arrangement and diagnosed as schwannoma Antoni A type (hematoxylin-eosin, original magnification x20).
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