Nódulos asépticos y alopécicos del cuero cabelludo

Alopecic and Aseptic Nodules of the Scalp: First Report in South America and Second in America

“…It will be citrine yellow in case of a lymphatic vessel, pink glassy in blood vessel, or purulent in case of a polymorphonuclear infiltrate [1,4]. Cultures are negative in all cases described [7].…”

“…Aseptic and alopecic nodules of the scalp (AANS), also named pseudocysts of the scalp, are a new, little-known, and for sure underdiagnosed disease [1]. AANS were first described in Japanese publications in 1992 [1] and were first named as pseudocysts of the scalp because cystic cavities with no real cystic wall were found in the histopathologic study [2].…”

“…AANS were first described in Japanese publications in 1992 [1] and were first named as pseudocysts of the scalp because cystic cavities with no real cystic wall were found in the histopathologic study [2]. The first cases in Western populations were described in France by Chevallier [3] in 1998, who called them “non-infectious abscesses and balding scalp.” It was not until 2009, when Abdennader et al [4,5] introduced the name “aseptic and alopecic scalp nodules,” because they did not find the cystic cavities in all of their cases as the Japanese did.…”

Alopecic and aseptic nodules of the scalp with trichoscopic and ultrasonographic findings

“…Histopathological features consist of a mixed inflammatory infiltrate in deep dermis (usually composed by lymphocytes or neutrophils, histiocytes, and giant cells), and in most cases, deep granulomas can be seen. [ 9 ] No fibrosis is generally associated. Pseudocyst formation seems to be a secondary change to inflammation, and it can also be related with duration and severity of the disease.…”