Cowden syndrome: report of a case with immunohistochemical analysis and review of the literature.

Cowden syndrome is a rare condition defined by multiple hamartomatous growths and a guarded prognosis owing to the high risk of cancer development. The syndrome is inherited as an autosomal dominant trait with incomplete penetrance and variable expressivity. The PTEN/MMAC1/TEP1 tumor suppressor gene on chromosome 10q23.3, has proven to contain a germline mutation predisposing for uncontrolled cell growth and survival via the PI3K/AKT pathway. Presented here is a case of Cowden syndrome in a patient with multiple hamartomas of the nose, midfacial skin and oral mucosa, and fissured tongue; plus a history of bipolar disease, iron deficiency anemia, basal cell carcinoma, fibroids of the uterus, and arthritis. The family history was significant for a daughter diagnosed with lung cancer. A final diagnosis of Cowden syndrome was made on the basis of established criteria and confirmed using immunohistochemistry directed against PTEN and phosphorylated-AKT.