Doughnut osteoma: A rare case of circumpapillary choroidal osteoma.

A 31-year-old male was referred for a choroidal mass in his left eye. Fundus examination revealed an orange-red elevated choroidal lesion around the optic disc with area of atrophy over macula. This was suggestive of calcified choroidal osteoma with decalcification at centre [Fig. 1a]. Ocular Coherence Tomography (OCT) showed Hypo-reflective cavernous spaces suggestive of spongy bone in calcified region, whereas, reflective pattern was seen from the posterior scleral tissue in decalcified region [Fig. 1b]. Choroidal osteoma is a benign ossifying tumour of choroid.[1] It is usually located in the juxtapapillary or peripapillary area.[23] Our case demonstrates a rare case of doughnut-shaped circumpapillary choroidal osteoma.

Figure 1

(a) Colour montage of left eye showing orange-red doughnut-shaped circumpapillary choroidal osteoma (black arrow) with decalcification in the centre (white arrow); (b) Swept-source optical coherence tomography showing choroidal lesion with multiple hyperreflective dots surrounded by hypo-reflective cavernous spaces suggestive of spongy bone (white dotted line) while, lamellar reflective pattern from posterior scleral tissue with loss of photoreceptors and outer retinal thinning is seen in the decalcified region (white arrows)

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