Cerebral Cavernous Malformations 4, also known as cerebral cavernous malformation 4, is related to gastric lymphoma and gastric ulcer. An important gene associated with Cerebral Cavernous Malformations 4 is PIK3CA (Phosphatidylinositol-4,5-Bisphosphate 3-Kinase Catalytic Subunit Alpha). Affiliated tissues include brain and breast, and related phenotype is cerebral cavernous malformation.