CT and MR imaging characteristics of histological subtypes of head and neck ossifying fibroma.

CT and MR imaging characteristics of histological subtypes of head and neck ossifying fibroma.

Dentomaxillofac Radiol. 2018 Mar 29;:20180085

Authors: Kawaguchi M, Kato H, Miyazaki T, Kato K, Hatakeyama D, Mizuta K, Aoki M, Matsuo M

Abstract
OBJECTIVES: The current study aimed to assess CT and MR imaging characteristics of histological subtypes of head and neck ossifying fibroma (OF).
METHODS: Twelve patients with histopathologically-proven head and neck OF were included in this study. Lesions were pathologically classified into three histological subtypes: 8 cement-OFs (COFs), 3 juvenile psammomatoid OFs (JPOFs), and 1 juvenile trabecular OF (JTOF). All patients underwent CT examination while 7 also underwent MR imaging. Imaging characteristics were retrospectively assessed.
RESULTS: On CT images, the lesion margins were well-defined in 9 patients (75%) (7 COFs and 2 JPOFs), partially ill-defined in 2 (17%) (1 COF and 1 JTOF), and ill-defined in 1 (8%) (1 JPOF). The continuity of the eroded overlying bone cortex was maintained in 9 patients (75%) (7 COFs and 2 JPOFs) but disrupted in 3 (25%) (1 COF, 1 JPOF, 1 JTOF). With respect to lesion density, homogeneous ground-glass opacity was observed in 5 patients (42%) (5 COFs), target-like appearance in 3 (25%) (2 COFs, 1 JPOF), and mixture of hyper- and hypodense areas were observed in 4 (33%) (1 COF, 2 JPOFs, 1 JTOF). MR signal intensity was homogeneous in 2 patients (29%) (2 COFs) and heterogeneous in 5 (71%) (2 COFs, 2 JPOFs, 1 JTOF).
CONCLUSION: COFs tended to exhibit well-defined margins and preserved continuity of the overlying bone cortex. COFs were usually homogeneous, whereas JPOFs and JTOF were always heterogeneous. Target-like appearance was one of the characteristics of OFs, but it was observed in both COF and JPOF.

PMID: 29595323 [PubMed - as supplied by publisher]

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