Submandibular salivary duct cyst mimicking an external laryngocele

The clinical and radiological differential diagnosis of cystic lesions of t he submandibular region can be difficult. We report an unusual case of a su bmandibular salivary duct cyst mimicking an external laryngocele on present ation by appearing to expand on Valsalva manoeuvre, and where computed tomo graphy (CT) scanning was unhelpful in reaching a diagnosis. We present the case, discuss the theories of pathogenesis, and review the literature on th e differential diagnosis of cystic lesions in the submandibular region.