Imaging Sci Dent.  2017 Dec;47(4):269-273. 10.5624/isd.2017.47.4.269.

Parotid mandibular bone defect: A case report emphasizing imaging features in plain radiographs and magnetic resonance imaging

• Hisatomi M
• Munhoz L
• Asaumi J
• Arita ES

• KMID: 2397842
• DOI: http://doi.org/10.5624/isd.2017.47.4.269

Abstract

Mandibular bone depression, also known as Stafne bone cavity, is defined as a bone depression filled mainly with salivary gland tissue. Parotid gland bone defects are infrequently observed. We report the case of a 52-year-old male patient who underwent radiographic examinations due to temporomandibular joint dysfunction, and a radiolucent area was detected in the mandibular ramus, with a provisional diagnosis of traumatic bone cyst or parotid mandibular bone defect. The patient was then referred for magnetic resonance imaging, which demonstrated a hyperintense area eroding the mandibular ramus, which corresponded to glandular tissue. Although the defect was a benign lesion, radiolucencies in the mandibular ramus lead to concerns among professionals, because their radiographic features can resemble various intrabony neoplastic lesions, such as giant cell tumors or benign tumors of the parotid gland.

Keyword

Bone Cysts; Salivary Glands; Magnetic Resonance Imaging; Radiography, Panoramic

MeSH Terms

Bone Cysts
Cytochrome P-450 CYP1A1
Depression
Diagnosis
Giant Cell Tumors
Humans
Magnetic Resonance Imaging*
Male
Middle Aged
Parotid Gland
Radiography, Panoramic
Salivary Glands
Temporomandibular Joint
Cytochrome P-450 CYP1A1

Figure

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  Fig. 1 Panoramic radiograph shows the ovoid radiolucent area in the left mandibular ramus (arrow).

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  Fig. 2 Four-part panoramic radiograph of the temporomandibular joint. Views of the temporomandibular joint with the mouth open and closed demonstrate the oval-shaped radiolucency in the left side of the mandibular ramus.

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  Fig. 3 An axial scout magnetic resonance image demonstrating a tiny hyperintense area in the left mandibular ramus, facing the lingual side (arrow number 1). Note the parotid glandular tissue (arrow number 2), which is also hyperintense. Arrow number 3 indicates the mandibular ramus.

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  Fig. 4 A proton-weighted magnetic resonance image reveals a hyperintense signal area on the left mandibular ramus (arrow).

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  Fig. 5 A T2-weighted magnetic resonance image shows a hyperintense signal area on the left mandibular ramus, corresponding to the defect in the mandibular ramus (arrow).

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