Acute Reversible Atypical Takotsubo Cardiomyopathy Following Trastuzumab and 5-Fluorouracil in a Young Patient.

Combined therapeutic regimens, including molecular targeted agents, are considered standard treatment for advanced gastric and gastroesophageal junction cancer. We present an extremely rare case of acute reversible cardiac dysfunction in a 20-year-old patient after administration of trastuzumab plus 5-fluorouracil for the treatment of metastatic gastroesophageal junction cancer. During the first day of chemotherapy, the patient complained of retrosternal pain radiating to the scapular regions bilaterally.