<prompt> This 12-year-old boy presented with abdominal pain. What is the diagnosis?Cowden syndromeCronkhite-Canada syndromeOsler-Weber-Rendu syndromePeutz-Jeghers syndrome  <response>: Answer D. Peutz-Jeghers syndromeThe presence of mucocutaneous pigmented lip lesions suggests the diagnosis of Peutz-Jeghers syndrome, an autosomal dominant disorder characterized by development of multiple hamartomatous gastrointestinal polyps. 