Cactus granulomas of the skin. An allergic phenomenon

Morphology of rare exogenous materials in dermatopathology

“…Injuries by cacti can induce a strong granulomatous response. 20 This happens through physical contact with the glochids. The latter are usually organized in groups of five to eight in the nipples of the cactus (Fig.…”

“…Schreiber et al favor an allergic response to antigenic substances of the glochids and barbs as the main mechanism for the granulomatous response, rather than just a foreign body response. 20 Barbs can be identified as elongated PAS-positive structures inside the granuloma. 20 Cacti barbs have been described as yellow elongated particle.…”

“…20 Barbs can be identified as elongated PAS-positive structures inside the granuloma. 20 Cacti barbs have been described as yellow elongated particle. 21 For example, Schreiber et al, included in their report a picture of a potassium hydroxide wet mount of a cholla cactus glochid, in which rows of barbs are easily identified.…”

“…21 For example, Schreiber et al, included in their report a picture of a potassium hydroxide wet mount of a cholla cactus glochid, in which rows of barbs are easily identified. 20 We studied histological sections of the glochids ( Fig. 2A), and identified the barbs as laminated structures covering the glochids (Fig.…”

Cactus bristle implantation. Report of an unusual case initially seen with rows of yellow hairs

“…2 We report a case of dermatitis resulting from contact with Opun¬ tia macrodasys that provided diagnostic difficulty at the time of initial examination. We were able to prove the presence of an acute dermatitis that evolved into a typical foreign-body granulomatous reaction.…”