Balloon-Release Pattern on the Chest X-ray of a Young Male Patient With Metastatic Testicular Choriocarcinoma: A Case Report of an Aggressive Pulmonary Presentation.

While testicular cancer (TC) is one of the most common malignancies in young men, choriocarcinoma (CC) represents one of the rarest subtypes within this group. CC is a non-spermatogonial germ cell tumor (GCT) with a highly aggressive presentation, requiring prompt and accurate diagnosis and management without delay. We present a case of a 24-year-old male patient who presented to the emergency department with nausea, vomiting, and shortness of breath. Physical examination revealed muscle wasting, fever, and a right testicular mass. A chest X-ray demonstrated a "cannonball" pattern of multiple pulmonary nodules. Chest CT confirmed bilateral pulmonary metastases, with the largest lesion measuring 8×7 cm, causing compression of the left pulmonary artery. An abdominopelvic CT revealed a 6×5 cm right testicular tumor. Further evaluation and orchiectomy confirmed metastatic CC, a rare form of TC. The patient was started on urgent chemotherapy and referred to a tertiary care center. This case highlights the importance of early recognition of aggressive metastatic CC and the need for prompt intervention in TC.