Gastroenterology clinical image challenge: A 43-year-old, previously healthy man developed jaundice, tiredness and intense pruritus. Symptoms started three days before presentation and included dark urine. He had no complaints of pain or fever. He had no history of alcohol use or substance abuse. The only medication used was ciprofloxacin (urinary tract infection) for 14 days six weeks before the onset of his symptoms. On physical examination there was conjunctival icterus and slight jaundice, with several edematous yellow plaques with an erythematous border distributed across the arms, upper legs and feet. The intensity of yellow discoloration increased after pressure on the skin by the patient (figure). Blood tests revealed a total bilirubin of 154 μmol/L (upper limit, 17 μmol/L), direct bilirubin 138 μmol/L (upper limit, 5 μmol/L), aspartate aminotransferase 748 U/L (upper limit, 40 U/L), alanine aminotransferase 1813 U/L (upper limit, 45 U/L) and alkaline phosphatase 133 U/L (upper limit, 120 U/L). He showed no signs of acute liver failure. Abdominal ultrasound imaging showed no abnormalities, with no signs of cholelithiasis. The severe pruritus led to nocturnal distress and intense scratching. After the start of treatment his complaints of pruritus and the skin lesions resolved within two days, without recurrence.
Based on these clinical symptoms, physical examination and laboratory findings, what is the most likely diagnosis of his pruritus?
To find out the diagnosis, read the full case in Gastroenterology.