# Case report: unilateral absence of the left pulmonary artery with left gastric artery collateral supply and hematologic disorder

## TL;DR

This case report describes a rare congenital condition where a person's left pulmonary artery is missing and is supplied by the left gastric artery, along with a hematologic disorder.

## Contribution

The novelty lies in the unique collateral supply from the left gastric artery to the left lung in a patient with multiple myeloma.

## Key findings

- Unilateral absence of the left pulmonary artery was incidentally discovered in a patient with multiple myeloma.
- The left lung showed atrophy and atelectasis, with the left gastric artery supplying the left lower lobe.
- The patient remained asymptomatic from the congenital condition until presenting with myeloma symptoms.

## Abstract

Unilateral absence of the pulmonary artery is a congenital disorder resulting from malformation of the sixth aortic arch during embryogenesis. This case report presents a unique instance of unilateral absence of the pulmonary artery, incidentally discovered in an individual with multiple myeloma. Despite a history of recurrent childhood pulmonary infections, the patient remained asymptomatic until presenting with symptoms of myeloma. Imaging revealed a right-sided aortic arch, absent left pulmonary artery, and left lung atrophy with atelectasis. Among various collateral arteries, a notable finding in this case is the left gastric artery supplying the left lower lobe.