Choroidal Osteoma in Oriental Patients
SUKHUMA WARRASAK, MJ)*,***, CHANET SUVARNAMANI, MD**, ATAYA EUSWAS,MD*,***, VIC HAl SUMETPIMOLCHAI, MD***, JIRAPORN LAOTHAMA TAS, MD****
Affiliation : * Department of Ophthalmology, Faculty of Medicine, Ramathibodi Hospital, ** Pramongkutklao Hospital, Bangkok 10110, *** Rutnin Eye Hospital, Bangkok 10110, **** Department of Radiology, Faculty of Medicine, Ramathibodi Hospital, Mahidol University, Bangkok 10400, Thailand. t Presented as a poster at the bicentennial annual meeting of the American Academy of Ophthalmology, October 1996, Chicago, Illinois. t Support in part by a faculty grant from Faculty of Medicine, Ramathibodi Hospital and by Rutnin Eye Foundation, Bangkok, Thailand.
Objective : To report the clinical characteristics, imaging findings and long-term follow-up of choroidal osteoma in four Oriental patients.
Method : Four cases of choroidal osteoma were observed for 5 years or more.
Results : All patients were young female patients whose ages ranged from 24 to 37 years. Three were unilateral and one was bilateral. The tumors were located at the juxtapapillary and macu lar area with overlying serous retinal detachment. Two patients had previous thyroid diseases and one was pregnant when the tumors were diagnosed. Osteoma did not develop in the vicinity of posterior staphyloma of high myopic eyes. Echography showed acoustic features of a plano-convex sonically dense lesion with high reflectivity echoes which persisted despite lower system sensitivity. None had subretinal neovascularization. Subretinal fluid disappeared spontaneously within one to 14 months in three patients. Gradual growth of the tumor in a pseudopodium manner developed from two to six years after initial examination. Decalcification occurred spontaneously or after laser ablation.
Conclusions : The authors presented four Oriental patients with choroidal osteoma who were observed for at least 5 years. Echography is the best method for identifying this lesion and has unique acoustic features. Subretinal fluid can be seen in the absence of subretinal neovascularization and resorbs spontaneously. Decalcification occurred as a natural process or after laser ablative treatment. Hormonal changes may implicate the development of this tumor.
Keywords : Choroidal Osteoma, Oriental Patients, Echography, MRI
