Extraconal cystic schwannoma mimicking an orbital dermoid cyst

Feijó, Eduardo Damous; Nery, Ana Carla de Souza; Caiado, Fábio Ramos; Prehis, Aline Maria; Limongi, Roberto Murillo

doi:10.5935/0004-2749.20160073

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Case Reports • Arq. Bras. Oftalmol. 79 (4) • Jul-Aug 2016 • https://doi.org/10.5935/0004-2749.20160073 linkcopy

Extraconal cystic schwannoma mimicking an orbital dermoid cyst

Schwannoma cístico extraconal simulando um cisto dermóide orbitário

Authorship SCIMAGO INSTITUTIONS RANKINGS

To our knowledge, we report the first case of an extraconal orbital cystic schwannoma in Brazilian literature. The tumor grew slowly and progressively and was associated with minimal eccentric proptosis and diplopia. The radiologic study (orbital computed tomography) revealed a rounded, encapsulated, and extraconal cystic mass in the superior medial region of the right orbit in the supraorbital and supratrochlear nerve topography. An anterior orbitotomy with full excision of the tumor was performed, and the histopathology examination revealed that the tumor was a schwannoma. After the surgery, the patient experienced total remission of his symptoms.

Keywords:
Neurilemmoma diagnosis; Neurilemmoma surgery; Orbital neoplasms; Exophthalmos; X-ray computed tomography

Author	Patient	Localization	CT findings	Pathologic findings
Imamura et al. 1986⁽⁶⁾	Male, 29 y	Intraconal	Solid lesion, intraconal space	Antoni A and B cells, benign tumor
Monteiro et al. 1994⁽⁷⁾	Female, 68 y	Intraconal	Solid lesion, intraconal space	Antoni A and B cells, anaplasic cell figures, malignant tumor
Bison et al. 1996⁽⁸⁾	Male, 39 y	Intraconal	Solid lesion, intraconal space	Antoni A and B cells, atypical mitotic figures, malignant tumor
Távora et al. 1999⁽⁹⁾	Male, 42 y	Extraconal, medially	Solid lesion, extraconal space	Antoni A and B cells, atypical mitotic figures, malignant tumor
Maciel et al. 2001⁽¹⁰⁾	Male, 14 y	Supraorbital nerve topography	Solid lesion, supraorbital topography	Antoni A and B cells, benign tumor
Coutinho et al. 2014⁽¹¹⁾	Female, 10 y	Upper eyelid	Solid lesion, upper eyelid	Antoni A predominant, benign tumor

Author	Patient	Localization	CT findings	Pathologic findings
Lam et al. 1997⁽²⁾	Male, 52 y	Extraconal, paramedian	Large paramedian cystic lesion, extraconal	Antoni A and B cells, benign tumor
Tsuzuki et al. 2000⁽³⁾	Female, 62 y	Intraconal	Cystic lesion	Antoni A predominant, benign tumor
Subramanian et al. 2005⁽⁵⁾	Female, 63 y	Intraconal	Intraconal mass with cystic spaces	Antoni A and B cells, benign tumor
Gündüz et al. 2011⁽⁴⁾	Male, 40 y	Extraconal, orbit medial wall	Extraconal mass, bilobed, cystic	Antoni A predominant and Antoni B cells, benign tumor
Hayashi et al. 2012⁽¹⁾	Female, 65 y	Frontal nerve topography	Cystic lesion, extraconal, above levator muscle	Antoni A and B cells, benign tumor

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[TFN1] y= years; CT= computed tomography.