title: [Transitional cell carcinoma in a young heavy marihuana smoker].
abstract: OBJECTIVE
  To report a case of low grade papillary transitional cell carcinoma of the left renal pelvis in a young, heavy smoker of marihuana who denied cocaine use, alcohol intake and other habits.
  
  
  RESULTS
  Intravenous pyelogram demonstrated a filling defect in the left renal pelvis and calyces. Biopsy revealed a urothelial carcinoma. The pathological analysis demonstrated diffuse low-grade non-invasive (Ta) papillary transitional cell carcinoma of the renal pelvis and calyces. Nephroureterectomy was performed.
  
  
  CONCLUSIONS
  This case indicates a cause-effect relationship between heavy and long-term marihuna smoking and transitional cell cancer. However, further cases from the literature or observations in larger populations are warranted.
authors.affiliation: Departamento de Urología, Hospital Príncipe de Asturias, Alcalá de Henares, Madrid, España.
authors.forename: P
authors.initials: P
authors.lastname: Moiche Bokobo
authors.forename: M A
authors.initials: MA
authors.lastname: Atxa de la Presa
authors.forename: J
authors.initials: J
authors.lastname: Cuesta Angulo
mesh_terms: D000328:Adult; D002295:Carcinoma, Transitional Cell / Q000209:etiology*; D006801:Humans; D007680:Kidney Neoplasms / Q000209:etiology*; D007682:Kidney Pelvis; D008297:Male; D002189:Marijuana Abuse / Q000150:complications*; D012720:Severity of Illness Index