MONDO_0016630 (isolated delta-storage pool disease) is a rare, isolated, constitutional thrombocytopenia disorder characterized by defective formation and/or malfunction of platelet dense granules, as well as melanosomes in skin cells, resulting in variable manifestations ranging from mild bleeding and easy bruising to moderate mucous/cutaneous hemorrhagic diathesis and bleeding complications after surgery. Also known as: isolated delta-SPD, isolated dense-SPD, isolated dense-storage pool disease.