CT Diagnosis of Rare Case of Morgagni Hernia in an Adult

1. Abstract

Introduction: Morgagni’s hernia is the rarest of the congenital diaphragmatic defects with a reported frequency of 1% to 5.1% Morgagni hernias are more commonly seen on the right side and it occurs more commonly in females. However, most patients remain asymptomatic and the majority of cases are discovered incidentally while investigating unrelated problems. Aim: The aim of this paper is to present a rare case of Morgagni hernia in adults and to empha-size the significant role of CT imaging in reaching the exact diagnosis of this condition. Case report: We present a rare case of 46 years old female with an incidentally detected congenital diaphragmatic hernia on the right side. CT scan is the investigation of choice for diagnosis of Morgagni’s hernia as it allows clear visualization of the defect, and its contents. The diagnosis is established by the presence of a retrosternal mass of herniated omentum or by a transverse colon. Surgical treatment options include a transabdominal or transthoracic repair, but in the case of larger defects, a mesh may be necessary.

2. Key words

Adult; Morgagni; Computed Tomography; Congenital; Diaphragmatic; Hernia; Repair

3. Introduction

Morgagni hernia was first described by Giovanni Battista Morgagni, an Italian anatomist, and pathologist in 1769 [1]. The foramen of Morgagni, also known as the sternocostal hiatus is a triangular space caused by a congenital defect in the fusion of septum transverses of the diaphragm and the costal arches [2]. Herniation of abdominal contents through this foramen is known as the Morgagni hernia. The majority of theses hernias occur on the right, but left-sided hernias have been reported. Morgagni hernia is the rarest form of congenital hernia, representing 2 to 3% of all case [3, 4].The majority of Morgagni hernias are diagnosed late because most adults can be asymptomatic or present with non-specific respiratory and gastrointestinal symptoms [5]. Diagnosis can be difficult and a missed diagnosis can lead to lifethreatening complications. In most adult cases these hernias are noted incidentally on chest X-ray. Depending on the contents of the hernia (omentum, stomach, small intestine, colon or liver) it can appear differently on chest radiography and the diagnosis can be missed. For example, if omentum is present in the sac, a solid pericardiac shadow will appear on the chest radiographs [6]. contrast is the investigation of choice as it allows clear visualization of the defect, and its contents [7]. When investigations are nondiagnostic, confirmation by laparoscopy may be needed. Although the majority of these hernias are asymptomatic, the repair is recommended to avoid future complications. If the hernia is small or if it contains omentum only, the operation is indicated when symptoms are recurrent. Operation is indicated when the colon is in the sac, as there is a high risk of obstruction. Treatment options include transabdominal or transthoracic repair [8, 9].

4. Presentation of Case (Case Report)

The aim of this report is to highlights the importance of early CT scanning in reaching the exact and early diagnosis of congenital diaphragmatic hernia, particularly since a delay in diagnosis can result in significant morbidity and mortality. Herein, we present a rare case of 46 years old female with an incidentally detected congenital diaphragmatic hernia on the right side and to emphasize the significantrole ofimaging forthediagnosis ofthis condition. She complained about epigastric and abdominal pain for one week and

5. Discussion

Diaphragmatic hernias of Morgagni were first described in 1769 as anatomical defects in the anterior diaphragm that allow herniation of abdominal viscera into the thorax [1]. The presence of this hernia in adulthood is very rare and, when symptomatic, it is usually associated with chronic respiratory symptoms (dyspnea, fatigue, pain) or gastrointestinal involvement with occlusive symptoms (constipation, occlusion) [10]. However, most patients remain asymptomatic and the majority of cases are discovered incidentally while investigating unrelated problems [11]. Despite being a congenital condition, many cases present only later in life. It is believed thisis due to the presence of a sac that limits herniation. Morgagni hernias are more commonly seen on the right side despite protection from the liver. It has been suggested that this happens because the presence of extensive pericardial attachments on the left provides extra support [10]. It occurs more commonly in females [9, 12]. Usually, the hernia sac contains the transverse colon followed by omentum, stomach, and small intestine but occasionally the liver may also protrude into the sac [13]. They are the rarest of congenital diaphragmatic hernias, making up 2-3% of cases [3, 4]. Incidental findings of this condition in adults are less common with only 81 asymptomatic cases reported in a recent review [3]. Symptomatic adult cases of Morgagni hernias are even rarer with only 12 cases described.2 Almost 90% of Morgagni hernias are reported to be on the right side, with 2% located on the left and 8% bilateral [14]. Depending on the contents of the hernia, the images in the chest radiography may appear differently [10]. On a chest radiograph, Morgagni hernias is frequently diagnosed incidentally as homogeneous masses in the right cardio phrenic angle [6]. Most frequently, it will show a solid pericardiac shadow due to the presence of omentum and the differential diagnosis should include a pleuropericardial cyst, pericardial fat mass, lipoma or liposarcoma, mesothelioma, diaphragmatic cyst, intrathoracic tumors, and eventration of the diaphragm [15, 3, 7]. However, it must be noted that plain radiography may be normal especially in intermittent herniation [5]. Another diagnostic option would be a barium enema, having the advantage of being less expensive. Ultrasonography has been shown to be useful in assessing diaphragmatic hernias but CT is the most sensitive an accurate diagnostic metod as it gives excellent anatomical detail on the contents of the hernia and its complications such as strangulation [16,17].

6. Conclusions

In conclusion, Morgagni hernia is a rare type of congenital diaphragmatic hernia in both adults and children and is more common on the right side. A missed diagnosis can lead to lifethreatening complications such as obstruction or strangulation which warrants early surgical intervention. Most asymptomatic cases were found in adults by chest radiography for unrelated problems. The diagnosis in the suspected case can be confirmed by a CT scan. Surgery by abdominal approach is the management of choice.

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Citation:

Gligorievski A. CT Diagnosis of Rare Case of Morgagni Hernia in an Adult . Annals of Clinical and Medical Case Reports 2020