A case of rhinosinusitis in a 14 year old diabetic boy, which had not responded to various antibiotic schemes, is presented. The diagnosis of rhinocerebral mucormycosis was late, when there was already intracraneal involvement, which was demostrated by CT scan. Considered out of surgical reach, he was treated with amphotericin B and multiple endoscopical debridements, with a good clinical and image outcome. The diagnosis of mucor was established by direct and histopathological examination which revealed the presence of characteristic hyphae.