Immunodeficiency-89 and autoimmunity (IMD89) is an autosomal recessive immune disorder characterized by adult onset of recurrent infections, allergies, microcytic anemia, and Crohn disease (see 266600) (Yang et al., 2020).

Lymphatic malformation-12 (LMPHM12) is characterized by abnormalities in the development and function of major truncal lymphatic vessels, causing nonimmune hydrops fetalis that results in stillbirth in some cases. Other affected individuals experience postnatal subcutaneous lymphedema and chylothorax, with pleural and pericardial effusions and ascites (Byrne et al., 2022). For a general phenotypic description and discussion of genetic heterogeneity of lymphatic malformation, see LMPHM1 (153100).