Trochlear Nerve Disease, also known as superior oblique muscle innervation disorder, is related to rare trochlear nerve disorder and nodular basal cell carcinoma. An important gene associated with Trochlear Nerve Disease is KRTAP4-4 (Keratin Associated Protein 4-4), and among its related pathways/superpathways are Nervous system development and Keratinization. Affiliated tissues include eye, and related phenotype is Decreased melanin production.