Isolated scalp collagenoma mimicking cutis verticis gyrata.

3 0 9 (celecoxib and valdecoxib) could possibly cross react with sulfonamides. The sulfonamide-type reactions (erythema multiforme, Stevens Johnson syndrome, toxic epidermal necrolysis (TEN) and maculopapular rash) were found to be twice as common with celecoxib as with rofecoxib. The pathogenesis of these reactions is likely to be the same as for sulfonamide induced reactions – T cell mediated type IV hypersensitivity reaction. However, Shapiro et al in their study on the safety of celecoxib in 28 patients with a history of sulfonamide allergy found cross reactivity between celecoxib and sulfonamides to be low.