# Hepatoid Adenocarcinoma of the Lung: A Case Report on a Rare Medical Condition

## TL;DR

This case report describes a rare lung cancer in an 82-year-old man that mimicked liver cancer and had a poor prognosis.

## Contribution

The novelty lies in documenting a rare hepatoid adenocarcinoma of the lung case with its clinical presentation and outcome.

## Key findings

- The patient was initially suspected to have metastatic HCC but was diagnosed with hepatoid adenocarcinoma of the lung.
- The patient received immunotherapy and chemotherapy but died within six months, indicating the aggressive nature of the disease.

## Abstract

We describe a case of an 82-year-old man who initially presented with back pain in the thoracic region and, on imaging, was found to have a right lower lobe lung nodule and a soft tissue mass eroding the posterior aspect of the right-sided ninth rib. Biopsy of this soft-tissue mass initially raised concern for metastatic HCC, but the patient was later found to have hepatoid adenocarcinoma of the lung. The patient was started on immunotherapy and a chemotherapy regimen, but unfortunately died within six months of diagnosis, highlighting the aggressive nature and course of the disease.