PMID- 30363967
OWN - NLM
STAT- PubMed-not-MEDLINE
LR  - 20201001
IS  - 2090-6862 (Print)
IS  - 2090-6870 (Electronic)
IS  - 2090-6870 (Linking)
VI  - 2018
DP  - 2018
TI  - Retroodontoid Pseudotumor Related to Development of Myelopathy Secondary to 
      Atlantoaxial Instability on Os Odontoideum.
PG  - 1658129
LID - 10.1155/2018/1658129 [doi]
LID - 1658129
AB  - Retroodontoid pseudotumor (ROP) is a nonneoplasic lesion of unknown etiology, 
      commonly associated with inflammatory conditions, and the term of pannus is 
      usually used. Less frequently, ROP formation can develop with other 
      noninflammatory entities, with atlantoaxial instability as most accepted 
      pathophysiological mechanism for posttraumatic or degenerative ROP. As it can 
      clinically and radiologically mimic a malignant tumor, it is paramount for the 
      radiologist to know this entity. Magnetic resonance imaging is the modality of 
      choice to reveal the possible severe complication of ROP in the form of a 
      compressive myelopathy of the upper cervical cord. The purpose of the surgical 
      treatment is the regression or complete disappearance of ROP, with posterior 
      decompression by laminectomy and posterior C1-C2 or occipitocervical fixation. We 
      present the case of an elderly patient with retroodontoid soft tissue mass 
      secondary to a chronic atlantoaxial instability on os odontoideum, an extremely 
      rare cause of ROP. The patient developed a posttraumatic cervical myelopathy 
      related to the decompensation of this C1-C2 instability responsible for the 
      formation of a compressive ROP. We will overview the retroodontoid pseudotumor 
      and its differential diagnosis.
FAU - Hamard, M
AU  - Hamard M
AUID- ORCID: 0000-0002-7173-4824
AD  - Department of Imaging and Medical Information Sciences, Division of Radiology, 
      Geneva University Hospitals, Geneva, Switzerland.
FAU - Martin, S P
AU  - Martin SP
AUID- ORCID: 0000-0002-2318-2420
AD  - Department of Imaging and Medical Information Sciences, Division of Radiology, 
      Geneva University Hospitals, Geneva, Switzerland.
FAU - Boudabbous, S
AU  - Boudabbous S
AD  - Department of Imaging and Medical Information Sciences, Division of Radiology, 
      Geneva University Hospitals, Geneva, Switzerland.
LA  - eng
PT  - Case Reports
DEP - 20180930
PL  - United States
TA  - Case Rep Radiol
JT  - Case reports in radiology
JID - 101580187
PMC - PMC6186371
EDAT- 2018/10/27 06:00
MHDA- 2018/10/27 06:01
PMCR- 2018/09/30
CRDT- 2018/10/27 06:00
PHST- 2018/05/31 00:00 [received]
PHST- 2018/09/10 00:00 [revised]
PHST- 2018/09/16 00:00 [accepted]
PHST- 2018/10/27 06:00 [entrez]
PHST- 2018/10/27 06:00 [pubmed]
PHST- 2018/10/27 06:01 [medline]
PHST- 2018/09/30 00:00 [pmc-release]
AID - 10.1155/2018/1658129 [doi]
PST - epublish
SO  - Case Rep Radiol. 2018 Sep 30;2018:1658129. doi: 10.1155/2018/1658129. eCollection 
      2018.