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A 70-year-old patient was admitted to the Department of Oral Medicine for multiple oral ulcerations on the left buccal mucosa, around 0.5 cm in diameter, as well as on the gingiva. Otherwise, the patient suffered from chronic lymphocytic leukemia, hypogammaglobulinemia, chronic renal insufficiency, with complete afunction of the right kidney, asthma, hypertension, gastritis and prostate hyperplasia. Differential diagnosis of oral ulcerations included drug induced oral ulcerations, paraneoplastic pemphigus, viral ulcerations (cytomegalovirus, herpes simplex viruses), fungal ulcerations (candidiasis, aspergillosis, histoplasmosis, cryptococcosis) and bacterial ulcerations, as well as neutropenic ulcers. One of the possible explanations was that the lesions were due to the use of drugs, the more so as oral lesions evolved when the doses of allopurinol and chlorambucil were increased, and subsided when the doses of both drugs were decreased. However, we could not establish for sure whether the lesions were due to allopurinol or chlorambucil. According to literature data, allopurinol is one of the most frequent drugs known to induce skin adverse reactions, therefore we assumed that it was the culprit drug. Unfortunately, several weeks later the patient died from sepsis, pneumonia with respiratory insufficiency and multiorgan failure.

A 70-year-old patient was admitted to the Department of Oral Medicine for multiple oral ulcerations on the left buccal mucosa, around 0.5 cm in diameter, as well as on the gingiva. Otherwise, the patient suffered from chronic lymphocytic leukemia, hypogammaglobulinemia, chronic renal insufficiency, with complete afunction of the right kidney, asthma, hypertension, gastritis and prostate hyperplasia. Differential diagnosis of oral ulcerations included drug induced oral ulcerations, paraneoplastic pemphigus, viral ulcerations (cytomegalovirus, herpes simplex viruses), fungal ulcerations (candidiasis, aspergillosis, histoplasmosis, cryptococcosis) and bacterial ulcerations, as well as neutropenic ulcers. One of the possible explanations was that the lesions were due to the use of drugs, the more so as oral lesions evolved when the doses of allopurinol and chlorambucil were increased, and subsided when the doses of both drugs were decreased. However, we could not establish for sure whether the lesions were due to allopurinol or chlorambucil. According to literature data, allopurinol is one of the most frequent drugs known to induce skin adverse reactions, therefore we assumed that it was the culprit drug. Unfortunately, several weeks later the patient died from sepsis, pneumonia with respiratory insufficiency and multiorgan failure., Bolesnik u dobi od 70 godina upućen je na Zavod za oralnu medicinu zbog nekoliko oralnih ulceracija na lijevoj obraznoj sluznici veličine oko pola centimetra u promjeru te na gingivi. Inače je bolovao od kronične limfocitne leukemije, hipogamaglobulinemije, kronične bubrežne insufi cijencije s potpunom afunkcijom desnog bubrega, astme, hipertenzije, gastritisa i hiperplazije prostate. Diferencijalna dijagnoza oralnih ulceracija uključivala je oralne ulceracije uslijed uzimanja lijekova, paraneoplastični pemfi gus, virusne ulceracije (citomegalovirus, herpes simpleks viruse), gljivične ulceracije (kandidijaza, aspergiloza, histoplazmoza, kriptokokoza), bakterijske ulceracije te neutropenične ulceracije. Jedno od mogućih objašnjenja je bilo da su lezije vjerojatno nastale uslijed uzimanja lijekova, jer su se pojavile kada se doza alopurinola i klorambucila povećala, a počele su nestajati kada se doza tih lijekova smanjila. Ipak, nismo sigurni koji je od ova dva lijeka doveo do nastanka lezija, jer je nažalost nekoliko tjedana poslije bolesnik izdahnuo uslijed sepse, pneumonije i respiracijske insuficijencije te višeorganskog zatajenja.