In the pediatric age group, the marrow in the phalangeal bones are still active, a conducive place for the<unk>  bacilli to multiply. Slowly, the whole marrow space gets involved and this underlying granulomatous disease leads to expansion of the overlying soft cortex. Finally there is a fusiform dilation of the bone, with thinned out cortex and destruction of the marrow space leading to a balloon like shape; this cystic type of expansion of the bone is termed as spina ventosa.
Tuberculous dactylitis
Dactylitis
Palindromic rheumatism
Enthesitis
Eosinophilic fasciitis
Arthritis mutilans
Glossitis
Blistering distal dactylitis