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The 2-year-old had surgery for the condition, called preaxial polydactyly or bifid thumb, at Shriners Children’s Chicago hospital this year.

Lettice, L. A., Hill, A. E., Devenney, P. S. & Hill, R. E. Point mutations in a distant sonic hedgehog cis-regulator generate a variable regulatory output responsible for preaxial polydactyly.

Pre-, prē, before, in compound words like preanal, preauditory, preaxial, prebasal, prebrachial, precardiac, precentral, precerebral, precloacal, precordial, precoracoid, predentate, pre-esophageal, &c.

When found in felines, the condition, formally known as preaxial polydactyly, is now commonly referred to as a “Hemingway cat.”

The penultimate and antepenultimate segments of the toxicognaths are reduced on the preaxial side of the appendage to the condition of arthrodial integumental folds and suppressed on the postaxial side where the distal segment or fang is firmly jointed to the femoral segment.