Absence or underdevelopment (hypoplasia) of the middle phalanx of the little (5th) finger.
Synonyms:
exact_synonym:
Absent/hypoplastic middle phalanx of 5th finger; Absent/small middle bone of pinky finger; Absent/underdeveloped middle bone of little finger; Absent/underdeveloped middle bone of pinkie finger; Absent/underdeveloped middle bone of pinky finger