The findings of the x-rays are consistent of post-axial polydactyly with fusion anomaly.

Usually, post-axial polydactyly is classified as type A (duplication at the MCPJ) or type B (rudimentary non-functioning digit). Clearly, neither are relevant here. In addition, the duplication of the phalanges appear to be within a single digit (polydactyly with accompanying syndactyly).