Mondo Description Isolated hereditary congenital facial paralysis (IHCFP) is an extremely rare neurological disorder presumed to result from maldevelopment of the facial nucleus and/or cranial nerve and has been reported in fewer than 10 families to date. It manifests as non-progressive, isolated, unilateral or bilateral, symmetrical or asymmetrical facial palsy. Involvement of the branches of the facial nerve can be unequal.