PMC5579562_01
Clinical appearance of OD. Note the mucous secretion, protrusion of the nictitating membrane, chemosis and congestion of conjunctival vessels.
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F1
However, the limited examination did not show any ocular lesions (Fig. 1).
Orbital ultrasound (10 MHz linear probe, transverse scan, temporal fossa approach) showing a large orbital fluid-filled space-occupying mass (M). The OD ocular examination (E) showed no abnormalities.
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F2
Ocular ultrasound was normal (Fig. 2).
Transverse plane through the orbit showing a large mass displacing the eyeball dorso-laterally (a) and crowded, multiple, abnormal, unerupted maxillary molars (b). Volume rendering, ventral view (e). Note the underdeveloped molar part of the right maxillary bone (arrow) and crowded, multiple, abnormal, unerupted maxillary molar teeth. Six month follow-up CT exam: transverse plane through the orbit (c, d) and volume rendering, ventral view showed no recurrence of the orbital pathology (f).
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F3
Crowded, abnormal, multiple, unerupted maxillary molar teeth were identified in the caudal maxillary region (Fig.3). At the 6-month clinical follow-up, the CT exam showed no recurrence (Fig. 3).
Gross anatomy of the mass (A). Histopathology of the mass haematoxylin and eosin x100 (B), x200 (C) and x400 (D). Note the granulation tissue embedding large, irregularly shaped lakes of clear amorphous material (mucous secretion/salivary secretion of zygomatic gland origin).
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F4
Microscopic evaluation of the biopsy tissues revealed numerous small acini of zygomatic gland embedded in a thick granulation tissue delineated in a border by abundant fibrin and amorphous hyaline homogeneous material (salivary secretion), partially infiltrated by macrophages consistent with mucocele (Fig. 4).