The story
The salient features of DiGeorge syndrome can be summarized by the mnemonic CATCH 22 (an allusion to Catch-22, a 1961 novel by Joseph Heller): * Cardiac defects, * Abnormal facies, * Thymic aplasia, * Cleft palate, * Hypocalcemia/hypoparathyroidism, and * 22q11.2 deletion.
Etymology from Wiktionary, CC BY-SA 4.0.