title: [Pseudocyst of the scalp: two cases].
abstract: BACKGROUND
  Pseudocysts of the scalp are a poorly known entity. Herein we present two new cases.
  
  
  METHODS
  Two male patients aged respectively 42 and 33 years had been presenting a small number of pseudocystic lesions on the scalp, as well as alopecia limited to the same region, for a number of years. Inflammatory episodes had occurred in certain lesions. In one case, biopsy showed an aspect typical of pseudocyst of the scalp and the lesions appeared to stabilize on treatment with doxycycline.
  
  
  CONCLUSIONS
  Pseudocysts of the scalp are also known as aseptic nodules of the scalp, a term that appears to us to be less appropriate. They form lesions involving alopecia and they may be inflammatory to various degrees. Following incision of these lesions, a deep yellow fluid liquid is released that may be shown by microbiological analysis to be sterile. Histological analysis reveals a pseudocystic wall associated with perilesional inflammatory remodelling. The cysts are frequently confused with dissecting cellulitis of the scalp, but the prognosis is more encouraging. Treatment involves surgical excision, and intralesional injections of corticosteroids or doxycycline.
authors.affiliation: Service de dermatologie, hôpital Beauregard, CHR de Metz-Thionville, 21, rue des Frères, 57100 Thionville, France.
authors.forename: A-L
authors.initials: AL
authors.lastname: Liegeon
authors.affiliation: Service de dermatologie, hôpital Beauregard, CHR de Metz-Thionville, 21, rue des Frères, 57100 Thionville, France.
authors.forename: A
authors.initials: A
authors.lastname: Schoeffler
authors.affiliation: Service de dermatologie, hôpital Beauregard, CHR de Metz-Thionville, 21, rue des Frères, 57100 Thionville, France.
authors.forename: B
authors.initials: B
authors.lastname: Lerondeau
authors.affiliation: Service de dermatologie, hôpital Beauregard, CHR de Metz-Thionville, 21, rue des Frères, 57100 Thionville, France.
authors.forename: P
authors.initials: P
authors.lastname: Muller
authors.affiliation: Service de dermatologie, hôpital Beauregard, CHR de Metz-Thionville, 21, rue des Frères, 57100 Thionville, France. Electronic address: f.truchetet@chr-metz-thionville.fr.
authors.forename: F
authors.initials: F
authors.lastname: Truchetet
mesh_terms: D000328:Adult; D000505:Alopecia / Q000188:drug therapy / Q000209:etiology / Q000473:pathology; D000900:Anti-Bacterial Agents / Q000627:therapeutic use; D020420:Cyst Fluid; D003560:Cysts / Q000175:diagnosis; D003937:Diagnosis, Differential; D004318:Doxycycline / Q000627:therapeutic use; D005499:Folliculitis / Q000175:diagnosis; D006101:Granuloma, Giant Cell / Q000188:drug therapy / Q000209:etiology / Q000473:pathology; D006801:Humans; D008297:Male; D012536:Scalp Dermatoses / Q000150:complications / Q000175:diagnosis* / Q000188:drug therapy / Q000473:pathology
chemical_list: D000900:Anti-Bacterial Agents; D004318:Doxycycline
keywords: Alopécie non cicatricielle; Aseptic nodules of the scalp; Cellulite disséquante du cuir chevelu; Dissecting cellulitis; Nodules aseptiques du cuir chevelu; Non-scarring alopecia; Pseudo-kyste du cuir chevelu; Pseudocyst of the scalp