Gemcitabine associated pseudocellulitis: A missed diagnosis.

We report a case of a 51-year-old male with past medical history significant for cholangiocarcinoma presented with two weeks of worsening bilateral lower extremity swelling and erythema. Patient has been on active chemotherapy for his cholangiocarcinoma with Gemcitabine weekly infusions. Physical exam was significant for bilaterally petechial rash coalescing into ecchymoses over the dorsum of the feet, sparing soles and toes, which dissipated into thinning petechiae more proximally. On labs he did not have any leukocytosis, his platelet count was 50 × 103/µL and basic metabolic panel was benign. Patient was started on Vancomycin for presumed cellulitis. Lower extremity ultrasound Doppler ruled out deep venous thrombosis. Patient did have biopsies bilaterally on his legs, which showed hypersensitivity reaction consistent with the diagnosis of pseudocellulitis. His Vancomycin was discontinued and his symptoms improved. Our case further supports that pseudocellulitis is underrecognized and underreported, potentially leading to unnecessary antibiotic exposure and unnecessary diagnostic work-up as seen unfortunately in our patient. Unnecessary antibiotic exposure is increasing the risk for clostridium difficile and or antibiotic resistance, therefore awareness of this reaction is critical, as to avoid unnecessary antibiotics, and costly diagnostic workups.