[Appendicular cystadenocarcinoma with cutaneous fistula].
BACKGROUND
Cutaneous metastasis of colorectal cancer is rare. We report a case of fistular lesions of the buttocks revealing a mixed tumour of the appendix involving mucinous cystadenocarcinoma and carcinoid tumour.


METHODS
A 67-year-old woman was admitted for four skin fistulae of the right buttock present for 6 years. Histological examination of skin biopsy specimens identified infiltration of the dermis by metastatic mucinous adenocarcinoma while colonoscopy showed a caecal tumour measuring 4 cm. Surgical excision was performed involving right hemicolectomy, evacuation of retroperitoneal mucin collection and excision of fistulae. Histopathological examination of surgical specimen confirmed mixed tumour consisting of perforated mucinous cystadenocarcinoma and carcinoid tumour of the appendix. Recurrence of the fistular lesions was seen. The patient was hospitalized several times for surgical drainage of mucin. She died one year later.


CONCLUSIONS
Cutaneous metastasis of colorectal cancer is an uncommon event that usually occurs after identification of the primary tumour and generally indicates advanced-stage disease and an ominous prognosis. This case is particular and underlines the need to rule out a metastatic origin of cutaneous fistulae, even in patients otherwise apparently in good health.
Service de dermatologie, hôpital Hédi Chaker, 3029 Sfax, Tunisie.
I
I
Hadj-Taieb
A
A
Masmoudi
L
L
Ayadi
T J
TJ
Meziou
A
A
Khabir
A
A
Charfeddine
S
S
Boujelbène
M I
MI
Beyrouti
N
N
Tahri
T
T
Boudawara
H
H
Turki
A
A
Zahaf
D000368:Aged; D001063:Appendiceal Neoplasms / Q000473:pathology*; D002276:Carcinoid Tumor / Q000473:pathology; D002430:Cecal Neoplasms / Q000473:pathology*; D017577:Cutaneous Fistula / Q000209:etiology* / Q000473:pathology; D018282:Cystadenocarcinoma, Mucinous / Q000473:pathology* / Q000556:secondary; D005260:Female; D006801:Humans; D009378:Neoplasms, Multiple Primary / Q000473:pathology*; D012878:Skin Neoplasms / Q000556:secondary
Cystadénocarcinome appendiculaire fistulisé à la peau.