Her pink haematuria was thought to be likely due to virus induced haemorrhagic cystitis. Urine and blood viral PCR (polymerase chain reaction) picked up adenovirus. Urine for cytomegalovirus and polyoma viruses were negative. Other blood viral PCR (cytomegalovirus, Epstein-Barr, parvovirus, rhino, parainfluenza, respiratory syncytial, influenza, Boca, metapneumo were negative. Haemorrhagic cystitis is coined by the presence of bright pink haematuria and lower urinary tract symptoms, such as dysuria, frequency, or urgency. It is most commonly caused by viruses. The most common encountered viruses are adenovirus, cytomegalovirus, and polyomaviruses.¹ Adenovirus, particularly serotypes 11 and 21 of subgroup B are the common among children.^1,2 Drugs also play an important etiological factor namely cyclophosphamide, ifosfamide and radiation therapy. Moreover, children on immunosuppressive drugs are prone to have haemorrhagic cystitis.³ Usually diagnosis is confirmed by PCR sequencing of urine.⁴ The differential diagnosis of pink haematuria could be urinary tract infection, kidney stones, bladder, urethral injury, and sexual abuse. Moreover, history of preceding diarrhoea may give clue to virus induced cystitis. The treatment of virus induced haemorrhagic cystitis is conservative as it generally spontaneously resolves within few days, However if it is persistent or is causing bladder outlet obstruction, then referral to urologist for cystoscopy and bladder irrigation may be required.⁵

References :

Gorczynska E, Turkiewicz D, Rybka K, Kalwak K, Dyla A, Szczyra Z, et al. Incidence, clinical outcome, and management of virus-induced haemorrhagic cystitis in children and adolescents after allogeneic hematopoietic cell transplantation. Biol. Blood Marrow Transplant. 2005;11:797-804 Decker DB, Karam JA, Wilcox DT. Pediatric haemorrhagic cystitis. J Pediatr Urol. 2009; 5: 254-264 Saito Y, Kumamoto T, Makino Y, Tamai I, Ogawa C, Terakado H. A retrospective study of treatment and prophylaxis of ifosfamide-induced hemorrhagic cystitis in pediatric and adolescent and young adult (AYA) patients with solid tumors. Jpn J Clin Oncol. 2016;46(9):856-861. Hemorrhagic Cystitis. Available from URL: https://en.wikipedia.org/wiki/Hemorrhagic_cystitis. Accessed on 2nd Sept 2020 Hemorrhagic Cystitis. Available from URL: https://emedicine.medscape.com/article/2056130-overview. Accessed on 2nd Sept 2020