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Title

Optic nerve metastases from rectal adenocarcinoma – a case report

Purpose	We present a rare case of a metastatic optic nerve disease due to histologically proven colorectal adenocarcinoma.
Methods	A 49-year-old man, with a known history of rectal adenocarcinoma, presented with progressive loss of vision in his left eye. On presentation, his vision was 6/36 in the right eye and counting fingers in the left eye.
Results	Fundus examination showed a left globally swollen optic nerve with a few flame haemorrhages. A gadolinium enhanced MRI scan was performed and demonstrated an abnormal thickening of the anterior and mid-section of the optic nerve with high signal on STIR and post gadolinium enhancement. An optic nerve biopsy was performed and histology confirmed the presence of epithelial adenocarcinoma compatible with metastasis of gut origin.
Conclusion	The patient died within 4 months of presentation.
Conflict of interest	No

Authors 1

Last name	JAMALL
Initials	O
Department	Maidstone Ophthalmology Department
City	Maidstone

Authors 2

Last name	Bates
Initials	A
Department	Maidstone Ophthalmology Department
City	Maidstone

Authors 3

Last name	Verity
Initials	D
Department	Moorfields Eye Hospital
City	London

Authors 4

Last name	Amin
Initials	S
Department	University College London Hospital
City	London