Orbital Metastasis from Hidradenocarcinoma.

Hidradenocarcinoma is a rare form of malignant adnexal tumor. This malignant tumor has been reported to metastasize to regional lymph nodes, and distant metastasis into structures like the orbit and extraocular muscle is uncommon. Orbital metastasis comprises about 10% of all orbital neoplasms. Common systemic malignancies contributing to orbital metastasis are breast cancer, prostate cancer, and skin malignancy, melanoma. We report the case of a middle-aged man with left axillary hidradenocarcinoma with an orbital metastatic lesion infiltrating the inferior rectus muscle with optic nerve involvement. This case report describes a rare presentation of orbital metastasis from an adnexal tumour.