PMC5362872_01
(a) A 10-year-old domestic shorthair cat presented with an erythematous, firm ulcerated gingival mass on the buccal aspect of the left maxillary third and fourth premolar teeth (teeth 207 and 208). (b) The corresponding intraoral dental radiograph showed a well circumscribed, radiopaque mass (arrow) affecting the interproximal region between teeth 207 and 208; some tooth resorption and loss of the periodontal ligament space (arrowheads) are evident around the mesiobuccal root of tooth 208
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An approximately 1 cm in diameter, raised, erythematous, firm, ulcerated gingival mass was observed on the buccal aspect of the left maxillary third and fourth premolar teeth (Figure 1a). Some tooth resorption and loss of the periodontal ligament space were noticed (Figure 1b).
(a) Buccal and (b) ventral views to the left maxillary area in a 10-year-old domestic shorthair cat. A surgical marker pen was used to outline the planned incisions. (c) Intraoperative view of the affected area after excision of the mass. (d) Closure buccal flap was sutured over the wound, using an absorbable monofilament in a simple interrupted pattern. (e) A postoperative intraoral radiograph was obtained, showing the affected area after rim excision (arrowheads), the left maxillary second premolar (arrow) and the zygomatic arch (asterisk). (f) The excised tissue was submitted for histopathological assessment. The asterisks show some intact roots of the third and fourth premolar teeth. Remaining root tips were extracted following excision of the mass. Because this was a clean-contaminated procedure, no surgical drapes were used. However, aseptic technique, including disposable synthetic or reusable cloth drapes may be used to minimize contamination
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A buccal flap was sutured to palatal mucosa with 5-0 poliglecaprone 25 (Monocryl; Ethicon) in a simple interrupted pattern (Figure 2).
(a) Photomicrograph of the submitted specimen showing proliferation of mineralized eosinophilic material (asterisk) that expands the gingiva (arrowheads) (x4 magnification, hematoxylin and eosin). (b) There are multiple irregularly placed lacunae (arrowheads) and reversal lines (arrow) (x20 magnification, hematoxylin and eosin). (c) The mass is focally adhered to a tooth root near the cementoenamel junction (arrowhead), contiguous with the normal cementum layer (arrow) (x4 magnification, hematoxylin and eosin)
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Histopathological examination showed proliferation of mineralized eosinophilic material with multiple, irregularly placed lacunae and reversal lines (Figure 3), reminiscent of cementum, between the two premolar teeth.