PurposeWe report photographically the evolution of a lesion of the left optic nerve head over a 2-year follow-up period in a patient with retinitis pigmentosa.
Case reportA 14-year-old boy was referred to the medical retina specialists with a 3-year history of night blindness. Best-corrected visual acuity was 6/18 in both eyes. Fundus examination revealed bone spicule pigmentary changes at the retinal mid-periphery. The retinal vessels were not significantly attenuated and the optic nerve head was not pale. Superficial globules at the margins of both optic discs were observed and regarded as optic nerve head drusen (Fig. 1).A diagnosis of retinitis pigmentosa was made and the patient was followed up yearly. Two years later, a fundus examination revealed evolution of the left optic nerve head lesion with a nodular appearance overlying the optic nerve head vessels (Fig. 2).Autofluorescence imaging of the left optic nerve head showed increased autofluorescence of the nodular mass (Fig. 3).Further investigations were recommended to exclude neurofibromatosis and tuberous sclerosis.
CommentIn our case, the lesion in the left optic nerve head was presumed to be a drusen on clinical examination in the first instance, but an examination 2 years later showed a change in the size and appearance with characteristics suggestive of optic nerve head astrocytic hamartoma.Astrocytic hamartomas of the optic nerve head are associated with certain types of phakomatoses but are also often seen in eyes with retinitis pigmentosa [1,2]. Although optic nerve head drusen are more common in patients with retinitis pigmentosa [3,4], they can be difficult to distinguish from an astrocytic hamartoma as illustrated in this case.In the past, when the distinction was not clear, many patients with retinitis pigmentosa were presumed to have optic disc drusen [5]. Subsequent analysis of these patients revealed that some of them had astrocytic hamartomas [6].To our knowledge, this is the first time such an evolution has been documented photographically in a patient with retinitis pigmentosa.