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Desmoplastic ameloblastoma of the jaw: CT and MR imaging findings

  • Akira BabaEmail author
  • Hiroya Ojiri
  • Manabu Minami
  • Takashi Hiyama
  • Mitsuru Matsuki
  • Tazuko K. Goto
  • Satoshi Tatsuno
  • Kazuhiko Hashimoto
  • Yumi Okuyama
  • Nobuhiro Ogino
  • Hideomi Yamauchi
  • Takuji Mogami
Original Article
  • 19 Downloads

Abstract

Objectives

Desmoplastic ameloblastoma (DA) is one of the rare pathological variants of ameloblastoma. The purpose of this study is to investigate CT and MR imaging findings of DA.

Methods

We retrospectively evaluated six DA cases that were gathered from four different hospitals and confirmed histopathologically with resected specimens. Two radiologists who specialized in head and neck imaging retrospectively interpreted and reviewed pretreatment CT and MR imaging findings.

Results

On CT, all DAs presented with well-defined border and low internal attenuation. Regarding locularity, five cases showed honeycomb-like lesions and one showed a unilocular lesion. Bone expansions were seen in all patients and located on the labial side in four cases. On MR imaging, all DAs showed well-defined borders and solid moderately low signal intensities with small cystic high signal intensities on T2-weighted images and intermediate signal intensity on T1-weighted images. Five DAs showed linear low signal intensity on T1- and T2-weighted images. Gd-DTPA-enhanced MR imaging was performed in three cases, and all cases showed moderate enhancement. Dynamic-enhanced MR imaging was performed in two of them, and persistent enhancement was detected.

Conclusion

Our findings strongly suggest that MR imaging should also be consulted, particularly for honeycomb-like lesions with well-defined margins, bone expansion and anterior location on radiographs or CT. Additionally, findings by MR imaging such as solid low-signal-intensity, hyperintense cystic foci and persistent enhancement pattern will suggest the diagnosis of DA.

Keywords

Desmoplastic ameloblastoma Magnetic resonance imaging Computed tomography Jaw 

Notes

Compliance with ethical standards

Conflict of interest

All authors declare that they have no conflict of interest.

Human rights statement

All procedures followed were in accordance with the ethical standards of the responsible committee on human experimentation (institutional and national) and with the Helsinki Declaration of 1975, as revised in 2008.

Informed consent

Informed consent was waived due to the retrospective nature of this study.

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Copyright information

© Japanese Society for Oral and Maxillofacial Radiology and Springer Nature Singapore Pte Ltd. 2019

Authors and Affiliations

  • Akira Baba
    • 1
    • 2
    Email author
  • Hiroya Ojiri
    • 1
  • Manabu Minami
    • 3
  • Takashi Hiyama
    • 3
    • 4
  • Mitsuru Matsuki
    • 5
  • Tazuko K. Goto
    • 6
  • Satoshi Tatsuno
    • 7
  • Kazuhiko Hashimoto
    • 8
  • Yumi Okuyama
    • 2
  • Nobuhiro Ogino
    • 1
  • Hideomi Yamauchi
    • 1
  • Takuji Mogami
    • 2
  1. 1.Department of RadiologyThe Jikei University School of Medicine and University HospitalTokyoJapan
  2. 2.Department of RadiologyTokyo Dental College Ichikawa General HospitalIchikawa-shiJapan
  3. 3.Department of Diagnostic and Interventional Radiology, Faculty of MedicineUniversity of TsukubaTsukuba-shiJapan
  4. 4.Diagnostic Radiology Division, Research Center for Innovative OncologyNational Cancer Center Hospital EastKashiwa-shiJapan
  5. 5.Department of Radiology, Faculty of MedicineKinki UniversityOsaka-SayamaJapan
  6. 6.Department of Oral and Maxillofacial RadiologyTokyo Dental CollegeTokyoJapan
  7. 7.AIC Yaesu ClinicTokyoJapan
  8. 8.Department of Pathology and Laboratory MedicineTokyo Dental College Ichikawa General HospitalIchikawa-shiJapan

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