title: Carcinomatous degeneration of pilonidal cyst with sacrum destruction and invasion of the rectum.
abstract: Malignant degeneration of pilonidal cysts is rare. The most common histologic type is the squamous cell carcinoma, triggered by the chronic inflammatory process. The growth of the lesion is typically slow. The diagnosis must be early and the appropriate treatment is ample surgical resection, including the presacral fascia. In some cases, as the present one, the diagnosis is made at a stage when the disease has progressed and invaded adjacent structures. In these cases the surgery involves multiple organ resection. We report the case of a patient with carcinomatous degeneration of pilonidal cyst, with bulky disease that extended up to the wall of the rectum. The treatment was extended resection, sacrectomy and abominoperineal resection of the rectosigmoid with permanent colostomy.
authors.affiliation: National Cancer Institute, Soft Tissue and Skin Cancer Department, Rio de Janeiro, Brazil.
authors.forename: Luiz Fernando
authors.initials: LF
authors.lastname: Nunes
authors.affiliation: National Cancer Institute, Soft Tissue and Skin Cancer Department, Rio de Janeiro, Brazil.
authors.forename: Antonio Kneipp Pitta de
authors.initials: AK
authors.lastname: Castro Neto
authors.affiliation: National Cancer Institute, Soft Tissue and Skin Cancer Department, Rio de Janeiro, Brazil.
authors.forename: Roberto André Torres
authors.initials: RA
authors.lastname: Vasconcelos
authors.affiliation: National Cancer Institute, Rio de JaneiroRJ, Brazil.
authors.forename: Flávio
authors.initials: F
authors.lastname: Cajaraville
authors.affiliation: National Cancer Institute, Rio de JaneiroRJ, Brazil.
authors.forename: Juliana
authors.initials: J
authors.lastname: Castilho
authors.affiliation: National Cancer Institute, Soft Tissue and Skin Cancer Department Chairman, Rio de Janeiro, Brazil.
authors.forename: José Francisco Netto
authors.initials: JF
authors.lastname: Rezende
authors.affiliation: National Cancer Institute, Rio de JaneiroRJ, Brazil.
authors.forename: Washington Silva
authors.initials: WS
authors.lastname: Noguera
mesh_terms: D001706:Biopsy; D002294:Carcinoma, Squamous Cell / Q000473:pathology* / Q000601:surgery; D018450:Disease Progression; D006801:Humans; D008297:Male; D008875:Middle Aged; D009361:Neoplasm Invasiveness / Q000473:pathology; D010864:Pilonidal Sinus / Q000473:pathology* / Q000601:surgery; D012004:Rectal Neoplasms / Q000473:pathology* / Q000601:surgery; D012447:Sacrum / Q000473:pathology* / Q000601:surgery; D012878:Skin Neoplasms / Q000473:pathology* / Q000601:surgery; D016896:Treatment Outcome