Monarch Disease Ontology term MONDO_0018128 (phalangeal microgeodic syndrome) is a rare primary osteolysis characterized by multiple small osteolytic areas and sclerosis in the phalanges of one or both hands associated with swelling and redness of the phalanges. Condition is benign, self-limited and may be associated with cold exposure. Also known as: phalangeal osteolysis.