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Correlation between radiologic and pathologic findings of 11 subconjunctival orbital fat prolapses

INTRODUCTION: Subconjunctival orbital fat prolapse (SOFP) is a rare condition (2% of orbital masses). The aim of the study was to describe CT and MRI findings of SOFP from a surgical series with confirmed histological diagnosis.

MATERIALS AND METHODS: A retrospective study was performed including all patients operated for SOFP at the university hospital of Poitiers between January 2012 and January 2020 with a pre-operative imaging. Patients clinical data were collected and imaging including MRI and CT reviewed.

RESULTS: Ten patients (corresponding to 11 SOFP), 8 males, 2 females (mean age = 76,2 +/- 12,9; BMI = 27,3+/-3,8) with pre-operative imaging (CT = 5, MRI = 3, Both = 2) were included. All diagnoses were confirmed by histological analysis. CT and MRI showed a homogeneous fatty subconjunctival mass communicating with intraconal mass. Associated diagnosis as thyroid associated orbitopathy and differential diagnosis such as dermolipoma and lacrimal gland lymphoma were discussed.

CONCLUSION: SOFP presents typical radiological features, as a fatty mass communicating with intraconal fat. A best knowledge of this lesion by radiologists could allow to make the diagnosis and rules out other diagnoses.

Keywords : SOFP, HOF, dermolipoma.