has part has part has_part characteristic of part of has modifier abnormal thymus lobule morphology abnormal thymus corticomedullary boundary morphology abnormal thymus CMZ morphology MPheno.ontology abnormal thymic corticomedullary boundary morphology abnormal thymus cortico-medullary zone abnormal thymus corticomedullary zone morphology MP:0009543 any structural anomaly of the dense region demarcating the thymus medulla from the surrounding cortex that is characterized by numerous blood vessels (predominantly arterioles) with some perivascular connective tissue, mature and immature T lymphocytes, dendritic cells, variable numbers of perivascular B-lymphocytes and plasma cells; site of entry of bone marrow stem cells and exit of mature, functional T cells abnormal thymus cortico-medullary junction abnormal thymus cortico-medullary boundary morphology abnormal thymus corticomedullary boundary