Esophagogastroduodenoscopy (EGD), also referred to as upper gastrointestinal endoscopy, is a procedure in which the health worker (endoscopist) uses a long flexible tube with a camera (endoscope) to pass through the mouth in order to visualize the mucosal surface of the esophagus, stomach and duodenum [1] . It is a key investigation required for screening and diagnosis of several disease conditions involving the gastrointestinal tract such as gastroesophageal reflux disease (GERD), esophageal candidiasis, esophageal varices, esophageal cancer, gastritis, duodenitis and gastric cancer, among others [2] - [4] . Symptoms attributed to such pathologies include: epigastric pain, heartburn, dysphagia, odynophagia, bloating, early satiety, postprandial vomiting, hematemesis and melena [5] . These conditions are associated with significant morbidity and mortality in various health facilities and the population at large [6] .

In many African countries, endoscopy services can only be accessed in a few health facilities [7] - [9] and many patients are treated empirically while others are referred to urban centres where the service can be accessed [10] . Nationwide surveys have demonstrated severely limited gastrointestinal capacity in sub-Saharan Africa when compared to the developed world [11] . This is attributed to few trained health personnel to handle these procedures, lack of equipment and inadequate infrastructure [12] [13] . Endoscopy is quite pivotal in the care, prevention and treatment of GI related malignancies because it allows one to take biopsies and therapeutic interventions can also be done when necessary [11] . In a recent population-based survey that looked at the cancer spectrum in Uganda, the most common cancers in females were cervical cancer (43%), breast cancer (22%), esophageal cancer (5.6%), ovarian cancer (5.2%) and Kaposi’s Sarcoma (4.7%) while in males, the most common cancers were those of the prostate (25%), esophagus (15.1%), KS (12.4%), liver (8.8) and stomach (4.8%) [14] . Since esophageal and gastric cancers are among the top five cancers, there is need for regular screening for these GI malignancies and several studies have highlighted individual experiences in endoscopy among health workers in sub-Saharan Africa [2] [4] [11] .

Whereas EGD is considered an invasive procedure that may be associated with some discomfort and a slight risk of morbidity or mortality, the introduction of modern equipment and better endoscopy practices have greatly minimised such drawbacks [15] . Thus, the procedure is safe and it can be performed on an outpatient basis [16] . EGD is the gold standard for patients who present with upper GI bleeding [17] .

Worldwide, a number of different endoscopy machines are under use and these include Ethicon Endo-Surgery, Olympus, Medtronic, Boston Scientific, Stryker, Smith and Nephew, Pentax, Karl Storz, Fujifilm, Hoya and Cook Medical, among others. Divine Mercy Hospital uses Olympus which is one of the best companies in the endoscopy devices market because of its high image quality and compatibility with a wide range of endotherapy devices [18] .

This study aimed at documenting the various indications and endoscopy findings in patients who underwent upper gastrointestinal endoscopy at Divine Mercy Hospital in south western Uganda.

Majority of our patients (56.6%) were males with a mean age of 55.4 (± 18.5) years. Similar studies in Uganda have also demonstrated male predominance in Mbarara at 59.8% [2] and Mbale at 56.9% [5] but there was a female predominance among patient who underwent endoscopy in one of the hospitals in the eastern region of Ghana [3] . However, the reason for this occurrence remains unclear. These two related studies in Uganda also reported a mean age of 53.5 years at Mbarara Regional Referral Hospital and 54.8 years at Mbale Regional Referral Hospital. These figures are comparable to the mean age that was seen in our study.

In this study, the main indication for EGD was epigastric pain followed by dysphagia. A number of other studies also reported epigastric pain as the main indication for EGD [2] [20] . Agyei-Nkansah et al., reported dyspepsia as the commonest indication for endoscopy at 76% followed by upper GI bleeding [3] . In a large study that was done in Ethiopia, Argaw et al., also reported dyspepsia as the commonest indication for EGD [21] . Dyspepsia is a symptom of postprandial distress, early satiation or epigastric pain or discomfort, or indigestion or bloating [22] . Thus, all these studies essentially reported the same symptom of epigastric pain as the main indication for endoscopy, but with a slight variation in nomenclature. Doe et al., reported dysphagia as the main indication for endoscopy at Mbale Regional Referral Hospital and this was closely followed by epigastric pain [5] . Summing up all the above studies, the most common indications for endoscopy are epigastric pain, dysphagia and upper GI bleeding.

Gastroesophageal reflux disease and esophageal tumors were the most common findings in the esophagus while gastritis and gastric tumors were predominant in the stomach. Duodenitis was also seen in the duodenum in 1.5% of the cases. Similar findings were also reported in Mbale [5] , Ethiopia [21] and Ghana [3] . Esophageal candidiasis was the sole diagnosis identified in 9.3% of all patients done EGD. Majority of esophageal tumors were located in the mid esophagus (55.8%), followed by distal esophagus (36.8%) and about half of the patients with esophageal cancer also had esophageal candidiasis but the primary diagnosis captured was the esophageal tumors because these patients had EGD done with the main indication being dysphagia. Our findings were similar to a study done in Tanzania by Mchembe et al., who reported that the middle third esophagus was the most common anatomical site for esophageal cancers at 58.5% followed by the lower third at 27.4% [23] .

In literature, there are two major histological types of esophageal cancer namely: Squamous Cell Carcinoma (SCC) and adenocarcinoma but SCC is the predominant type worldwide [24] . In our study, SCC was predominant at 79.2%. However, Schlansky et al., reported adenocarcinoma as the most common histological subtype in Philadelphia [25] . In our study, esophageal cancer was more common among males above 50 years of age. Worldwide, a higher incidence of esophageal cancer has been reported among males in the 6^th and 7^th decade of life [24] [25] . A study done, in Tanzania reported that esophageal cancer contributed 25.3% of all malignant gastrointestinal tumors and SCC of the esophagus accounted for 96% of all esophageal cancer and the risk factors attributed to this high figure were smoking, alcohol consumption and family history of the esophageal cancer [23] . Similar studies also reported that esophageal cancer contributed 13.3 % of all GI malignancies in Nigeria [26] and 32.5% in Adis Ababa [27] .

In the stomach, majority of the tumors had a histological diagnosis of adenocarcinoma accounting for 85.7% and these tumors were predominantly in the distal half of the stomach. Most of our patients were males above 50 years of age. In Yemen, Kassim et al., also reported adenocarcinoma as the most common histological variant among patients with gastric cancer accounting for 92.4%, with a mean age of 64.98 ± 15.15 years, and the male to female ratio was 2.5:1 [28] . Another study in Nigeria also showed similar findings with gastric adenocarcinomas being more common among males aged 50 to 60 years and the tumor location was predominantly in the antrum/pylorus [29] . Similar findings were also reported in Rwanda [30] , Ethiopia [31] and Kenya [32] . The histologic classification of gastric cancer is largely based on Lauren’s classification, in which intestinal type and diffuse type adenocarcinomas are the two major histologic subtypes [33] . Majority of our patients had intestinal type adenocarcinoma which was in line with other studies in literature [28] [29] [34] - [36] . Whereas Borrmann’s classification can be used as a valuable factor to predict overall survival among patients with gastric cancer [37] , the findings at endoscopy that were reported for patients with gastric tumors did not indicate the Borrmann’s type. Our study did not report any case of malignancy in the duodenum, and this is not surprising since duodenal cancers are generally rare, accounting for less than 1% of all gastrointestinal tumors [38] [39] . The available histology results for the samples taken from the duodenum only revealed duodenitis. Although the clinical stage of esophageal and gastric cancers at the time of presentation significantly affects patient outcomes; cancer staging, therapeutic interventions and treatment outcomes were beyond the scope of our study and therefore, they are not discussed here.

In south western Uganda, the most common indication for EGD was epigastric pain followed by dysphagia. Gastritis and GERD were the main benign findings at endoscopy. Esophageal malignancies were more common in the mid esophagus and majority were SCC. Gastric tumors were more common in the distal half of the stomach and they were mainly intestinal type adenocarcinomas.

Patients with recurrent upper GI symptoms need EGD for screening and early detection of upper GI malignancies.

The main source of information for our study was the endoscopy reports. They had limited information about patient demographics and clinical presentation. Any possible risk factors for occurrence of our findings were completely missing. We also had some missing histology results because the reports could not be traced. Thus, our analysis was limited to the available study variables.

We are very grateful for the support accorded to us by the Faculty of Medicine at Mbarara University of Science and Technology and the team at DMH.