Subungueal-splinter hemorrhage an early sign of thromboangiitis obliterans.

Subungueal splinter hemorrhage (S.U.S.H.) has been reported in various conditions and may herald a serious systemic disease. It has been related to miscellaneous conditions such as: subacute bacterial endocarditis, severe rheumatoid arthritis, uninfected mitral stenosis, trichinosis, peptic ulcer, hypertension, neoplasm, trauma, and in some cases, is considered idiopathic. Some dermatologic conditions such as psoriasis, dermatitis, and fungal infections may also produce S.U.S.H. It consists of "a homogeneous mass of blood in a layer of squamous cells, adherent to the under surface of the nail, considered to be of embolic origin." In a brief review of pertinent medical literature on thromboangiitis obliterans, we were unable to find a description of its occurrence in this disease. The earliest lesions described in this condition are "painful vesicles on the pulp of digits with intense hyperemia and hypersensitivity of the surrounding skin." It is our opinion that S.U.S.H. is an earlier and quite useful sign of arterial involvement as seen in the following cases observed in our vascular disease section.