Eurasian Journal of Pulmonology

: 2020  |  Volume : 22  |  Issue : 1  |  Page : 64--66

Unilateral absence of pulmonary artery: A rare cause of dyspnea in a 77-year-old woman

RK Chopra, Mohanakrishnan Jayamani, Ganesh Pratap 
 Department of Chest Medicine, Ruby Hall Clinic, Pune, Maharashtra, India

Correspondence Address:
Dr. Mohanakrishnan Jayamani
Department of Chest Medicine, Ruby Hall Clinic, 40, Sasoon Rd, Sangamvadi, Pune - 411 001, Maharashtra


Isolated unilateral absence of pulmonary artery is quite rare and usually associated with congenital cardiac defects. It is usually diagnosed in childhood with recurrent respiratory tract infections and signs of pulmonary hypertension. It rarely remains asymptomatic until adulthood and may present with dyspnea, hemoptysis, and recurrent respiratory infections later, while it can rarely be an incidental finding of other imaging. Surgical management in early days of life will prevent pulmonary hypertension while in adults it is aimed to treat the complications. Here, we report the case of a 77-year-old female, a mother of five children. She came with worsening of dyspnea for a week, and her computed tomography pulmonary angiography showed absence of left pulmonary artery accompanying hypoplastic lung. Ventilation perfusion imaging showed absence of perfusion of the left lung. She had severe pulmonary hypertension and was managed with long-term oxygen therapy, diuretics, and vasodilators.

How to cite this article:
Chopra R K, Jayamani M, Pratap G. Unilateral absence of pulmonary artery: A rare cause of dyspnea in a 77-year-old woman.Eurasian J Pulmonol 2020;22:64-66

How to cite this URL:
Chopra R K, Jayamani M, Pratap G. Unilateral absence of pulmonary artery: A rare cause of dyspnea in a 77-year-old woman. Eurasian J Pulmonol [serial online] 2020 [cited 2020 Nov 28 ];22:64-66
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Full Text


Unilateral absence of pulmonary artery (UAPA) is a very rare congenital entity with the incidence of 1 in 200,000 people.[1] The first case was reported by Fraentzal in 1868 and up to now, 400 cases have been reported in literature.[2],[3] UAPA of the right lung is seen in 65% of cases, whereas that of left side is seen 35% of the reported cases.[4] It is usually associated with cardiac anomalies such as tetralogy of Fallot, septal defects, and transposition of great arteries.[5] Absence of pulmonary artery is thought to be the involution of the sixth branchial arch. The average age of clinical presentation was reported as 14 years of age.[4] We reported the case of a 77-year-old female with absence of the left pulmonary artery without any cardiac defects. As far we know, our report is the oldest case of UAPA.

 Case Report

A 77-year-old woman, a mother of five with no comorbidities, came to our hospital with worsening dyspnea for 5 days. She never had any prior hospitalization in medical history. On physical examination, she had tachycardia, tachypnea, and hypotension. Her arterial oxygen saturation was 78% and jugular venous pressure was high, and she had bilateral pretibial edema. Pulmonary examination revealed the signs of volume loss of the left hemithorax together with dull note on percussion and stony dull note over the right lower hemithorax. Breath sounds reduced on the left and fine crackles were heard over the right with loud P2. Arterial blood gas was consistent with Type 1 respiratory failure, and chest X-ray revealed shift of mediastinum to the left side and left lung hypoplasia [Figure 1]. Two-dimensional (2D) transthoracic echocardiography showed that pulmonary artery pressure was 92 mmHg with grossly dilated right heart chambers and left ventricular ejection fraction of 50%. With a suspicion of massive pulmonary embolism, the patient underwent computed tomography pulmonary angiography (CTPA) and Doppler ultrasonography of the lower limbs. Doppler was normal; however, CTPA showed absence of left pulmonary artery without any evidence of pulmonary thromboembolism. There was a gross mediastinal shift to the left, hypoplasia of the left lung, patchy infiltrates in the right upper lobe, and bilateral pleural effusion with right basal atelectasis [Figure 2]. During the course of hospitalization, the patient had desaturation, and she underwent intubation and needed mechanical ventilation support. Pleural effusion was consistent with transudate and attributed to right heart failure, and post diuretic therapy, there was reduction in the pleural fluid volume. No organisms were isolated in the sputum and body fluids and here, infective markers were within normal limits. Ventilation perfusion scintigraphy showed the absence of perfusion on the left lung [Figure 3]. The patient was taken to the ward and then, she was discharged with long-term oxygen therapy, vasodilators, and prophylactic oral anticoagulants. The patient's follow-up continues in the outpatient clinic.{Figure 1}{Figure 2}{Figure 3}


Congenital UAPA is a very rare anomaly with the incidence of 1 in 200,000 population.[1] The first case was reported by Fraentzel in 1868.[2] Nearly 400 cases had been reported in literature so far.[3] UAPA of right lung seems to be 65%, whereas that of left lung seems to be involved in 35% of the reported cases.[4] In our patient, left pulmonary artery was absent.

The most common clinical presentation of UAPA is dyspnea (40%) followed by recurrent respiratory tract infections (37%) due to bronchiectasis, and hemoptysis (20%) because of systemic collaterals from bronchial, intercostal, subclavian, subdiaphragmatic, and rarely coronary vessels. Rarely, it can be recognized as an incidental finding of asymptomatic person.[4],[6],[7] In our case, the patient presented with dyspnea as her major symptom. Only very few cases had been reported and as far we know, our report was of the oldest female in literature.

Chest X-ray of patients with UAPA shows hypoplasia of lung with mediastinal shift similar to our case, and others findings can be ipsilateral elevation of diaphragm, absence of hilar shadow, and contralateral compensatory hyperinflation of the hemithorax.[3],[8]

CT thorax and also CTPA help the diagnosis as similar to our case, and they also identify parenchymal abnormalities. Ventilation perfusion scintigraphy shows the absence of perfusion in the affected side as in our patient.[9] Pulmonary angiography is the gold standard of diagnosis of UAPA, and it also identifies collateral circulation.[8]

2D transthoracic echocardiography helps the identification of cardiac defects which are usually seen together with UAPA. In our case, there were no cardiac defects, and the patient had severe pulmonary hypertension.

Medical management of UAPA cases includes treatment of pulmonary hypertension with long-term oxygen therapy, calcium channel blockers, and vasodilators.

Surgical options include creation of aortopulmonary shunt or restoration of continuity between main and hilar pulmonary arteries when diagnosed at an early age.[10] Pneumonectomy or lobectomy in the case of massive hemoptysis and recurrent respiratory infections should be needed. Selective arterial embolization can be considered in some patients who are not fit for surgery. The mortality rate is about 7% in patients with UAPA.


Thus, UAPA can have various spectra of symptoms and can also rarely be found in older patients. It is rarely thought in the differential diagnosis in patients presenting with dyspnea. Imaging techniques can help the diagnosis and various medical and surgical management options are available for this condition depending on the age of patient. In this case report, we tried to emphasize the importance of this very rare congenital anomaly.

Declaration of patient consent

The authors certify that they have obtained all appropriate patient consent forms. In the form, the patient has given her consent for her images and other clinical information to be reported in the journal. The patient understands that her name and initial will not be published, and due efforts will be made to conceal her identity, but anonymity cannot be guaranteed.

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Conflicts of interest

There are no conflicts of interest.


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