Ainhum, as described in textbooks and various articles, consists in the formation of a narrow strip of hardened skin, the so-called ``constricting ring." which gradually involves the whole circumference of the little toe, on a level with the digitoplantar fold. This constriction forms a deep circular furrow which gradually increases in depth and length and follows the absorption of the tissues, including the bone, underneath the ring, and as a result either of injury or of gangrene terminates in spontaneous amputation of the portion of the toe distal to the ring. The distal part of the toe is usually enlarged to two or three times its normal size, and before falling off assumes the form of a tumor attached by a pedicle to the rest of the toe. The amputation takes place at the second or third joint or through the phalanx. The ring is located near the proximal
BLOOM D, NEWMAN B. AINHUM: REPORT OF A CASE WITH ROENTGENOLOGIC FINDINGS AND REVIEW OF LITERATURE. Arch Derm Syphilol. 1933;27(5):783–793. doi:10.1001/archderm.1933.01450040792009
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