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Signet-ring cell adenocarcinomas (SRCCs) are rare tumors that most commonly originate from the stomach, colon, or breast. Lung as a site of the primary signet-ring variant of adenocarcinoma is extremely uncommon. Primary SRCC of the lung is a highly aggressive variant of adenocarcinoma with characteristic clinicopathological features. Here, we present a case of a young female with a rapidly progressive tumor in the left lung with metastasis to the pleura, pericardium, and lymph nodes having a histopathological proof of primary adenocarcinoma with signet-ring features.