Gastrointestinal bleeding caused by syphilis: A case report

Abstract

BACKGROUND

Syphilis is a chronic, classic sexually transmitted disease caused by Treponema pallidum, which can invade almost all organs of the body and produce various symptoms and signs. Although there are some cases of colorectal bleeding caused by syphilis, small intestinal bleeding caused by syphilis is still rare.

CASE SUMMARY

A 58-year-old man had experienced recurrent abdominal pain and melena for 3 years. Repeated gastroenteroscopy and computed tomography angiography examinations failed to find bleeding lesions. During the same admission, multiple intestinal ulcers were found by capsule endoscopy, and syphilis was also diagnosed. With a history of atrial fibrillation and chronic pancreatitis, he had undergone mitral valve replacement and tricuspid valvuloplasty for valvular heart disease. After anti-syphilis treatment, the melena and abdominal pain disappeared and his hemoglobin gradually increased. It is considered that gastrointestinal bleeding, chronic pancreatitis, atrial fibrillation, and heart valvular disease may have been caused by syphilis.

CONCLUSION

This case report found that syphilis can mimic systemic disease and cause intestinal bleeding. In addition, treatment of the disease requires both sexual partners to be treated. Finally, although syphilis is easy to treat, it is more important to consider that bleeding could be caused by syphilis.

Key Words: Treponema pallidum, Alimentary tract hemorrhage, Small intestinal ulcer, Gastrointestinal syphilis, Infectious diseases, Case report

Core Tip: Syphilis is considered a sexually transmitted disease, which can affect all systems of the body and cause multiple clinical signs and symptoms. We report a rare case of gastrointestinal hemorrhage caused by Treponema pallidum. The case occurred in an adult male patient. The patient has not only suffered from atrial fibrillation, heart valvular disease, chronic pancreatitis, etc. for more than 10 years, but has also undergone heart valve replacement surgery. In recent years, the patient experienced recurrent unexplained gastrointestinal bleeding. Finally, based on careful analysis, syphilis was identified as the cause of intestinal ulcers that eventually led to gastrointestinal bleeding. This case shows that syphilis is a systemic disease and that it is important to treat syphilis as a couple.

INTRODUCTION

Gastrointestinal bleeding is a common disease of the digestive tract. Hematemesis and blackness are its common manifestations. Most gastrointestinal bleeding can be diagnosed by gastroenteroscopy. Intestinal bleeding is often considered when the cause cannot be determined by repeated gastroenteroscopy, and capsule endoscopy, small colonoscopy, abdominal computed tomography angiography (CTA) or magnetic resonance angiography (MRA) can be used to identify lesions in the small intestine. Syphilis is a sexually transmitted infection that can cause systemic disease[1]. Some cases of intestinal bleeding have been reported to be caused by infection with syphilis[2]. Intestinal bleeding itself is uncommon, accounting for about 10% of all cases gastrointestinal bleeding[3], and syphilis is a rare cause of intestinal bleeding.

CASE PRESENTATION

Chief complaints

A 58-year-old man had experienced recurrent abdominal pain and melena for 3 years, but repeated gastroenteroscopy and CTA had failed to find bleeding lesions.

History of present illness

On June 30, 2020, the patient presented to our department with a history of recurrent abdominal pain and melena for 3 years. In June 2017, he developed recurrent localized and dark pain in the upper abdomen without obvious inducement. It was tolerable, lasted for about 1 h, occurred about 3 times a day and was accompanied by thin, textureless melena, dizziness, and fatigue. His symptoms occurred repeatedly. He had gone to major hospitals across the country many times, but there was no clear diagnosis, and conservative treatment was used for alleviation. Two months before admission, the above symptoms progressively worsened. Melena was passed 4-5 times a day, with a total volume of about 200 g, and the dizziness and fatigue were significantly worse than before. After symptomatic treatment of hemostasis in the local hospital, the symptoms were improved, but still existed.

History of past illness

He was diagnosed with syphilis in 2008. Multiple treatments were successful, but the disease recurred shortly afterward. Because of heart valve disease, he underwent a mitral valve replacement and tricuspid valvuloplasty at Fujian Provincial Hospital In 2010. In 2019, he was diagnosed with atrial fibrillation and chronic pancreatitis. Currently, he is taking Betaloc 23.75 mg qd orally.

Personal and family history

The patient had a history of unprotected intercourse with multiple sexual partners, a smoking history for 40 years (20 cigarettes a day), and a drinking history for 30 years. There is no family history of infectious or heredity diseases.

Physical examination

On admission, his temperature was 36 ℃, pulse was 66 beats/min, respiration was 18 breaths/min, and blood pressure was 120/80 mmHg. He was conscious and could cooperate in the physical examination. The skin of the whole body was slightly pale. Systemic superficial lymph nodes were not enlarged or tender, the conjunctiva was pale, the lips were slightly pale, carotid artery pulsation was normal, jugular vein was normal, liver jugular vein return sign was negative, and lung physical examination was not remarkable. There was a postoperative scar of about 20 cm in length on the chest, which had healed well. The heart rate was 80 beats/min, the heart rhythm was absolutely uneven, the first heart sound varied in intensity, a systolic murmur was heard in the mitral valve auscultation area, no obvious pathological murmur was heard in the other auscultation area, the fricative consonant was unintentionally included, the abdomen was flat and soft without tenderness or rebound pain, and the abdomen was not lumped. The liver and spleen were not touched, Murphy’s sign was negative, and there was no mobile dullness. Intestinal sounds (4/min) were normal.

Laboratory examinations

The initial hemoglobin of the patient was 78.0 g/L and fecal occult blood was present (++). The syphilis toluidine red unheated serum test (TRUST) was positive; the syphilis titer was 1:2 positive. The white blood cell count, platelets, coagulation function, antinuclear antibody, antinuclear antibody profile, fecal routine, urine routine, alpha fetoprotein, carcinoembryonic antigen, glycogen antigen 199, total iron binding capacity, serum iron, unsaturated iron binding capacity, ferritin, folic acid, vitamin B12, purified protein derivative (PPD tuberculin test, tuberculosis antibody, and tuberculosis T-cell test showed no obvious abnormalities.

Imaging examinations

The patient’s upper abdominal magnetic resonance cholangiopancreatography revealed splenomegaly, and dilatation of the intrahepatic and extrahepatic bile ducts and pancreatic ducts (Figure 1).

Figure 1 Magnetic resonance cholangiopancreatography of the upper abdomen revealed splenomegaly (arrow 2) and pancreatic duct dilatation (arrow 1).

Other examinations

An electrocardiogram indicated atrial fibrillation (Figure 2). Colonoscopy found multiple small ridges in the terminal ileum, and the pathology showed chronic active inflammation and erosive mucosa. Additional gastroscopy showed atrophic gastritis, and pathology of the gastric antrum indicated inflammation, and the Helicobacter pylori test was negative. Ultrasound gastroscopy showed dilatation of pancreatic duct with pancreatic duct stones, which was considered as chronic pancreatitis (Figure 3). A capsule endoscopy was performed to further clarify the bleeding focus of the patient, and multiple intestinal erosions and ulcers were found (Figure 4). The bone marrow puncture smear of the iliac spine showed normal hematopoietic tissue hyperplasia, presence of three-line hematopoietic cells, expanded islands of erythroid cells, hyperplasia of erythroid cells, a reduced granulocytosis ratio, and a scattered distribution of megakaryocytes, which was considered as hyperplastic anemia (Figure 5).

Figure 2 Electrocardiogram showing atrial fibrillation.

Figure 3 Ultrasound gastroscopy suggested the possibility of pancreatic duct stones (arrow 1) with dilatation of the pancreatic duct (arrow 2).

Figure 4 Capsule endoscopy revealed multiple intestinal ulcers (arrow).

Figure 5 Bone marrow puncture smear of the iliac spine suggestive of hyperplastic anemia.

FINAL DIAGNOSIS

The final diagnosis was minor intestinal bleeding caused by syphilis.

TREATMENT

In hospital, the patient was started on benzathine penicillin (2.4 million units intramuscular injection) once weekly for 3 wk for the treatment of syphilis and thrombin (2000 units orally) 3 times daily for 3 consecutive days for the treatment of hemorrhage.

OUTCOME AND FOLLOW-UP

The patient’s hemoglobin gradually decreased from 78 g/L on June 29 to 68 g/L on July 3. After receiving oral thrombin and benzathine penicillin, the patient’s Hb gradually increased to 87 g/L on July 14 without blood transfusion (Figure 6 and Table 1). The patient also contacted her spouse for treatment of syphilis. After 6 mo of follow-up, the patient did not have gastrointestinal bleeding symptoms, such as hematemesis, melena and hematochezia, the Hb gradually recovered to about 120g/L by the second visit, and the syphilis titer was retested (-).

Figure 6 Changes in hemoglobin during hospitalization.

Table 1 Changes in hemoglobin (g/L).

Factor
Date	2020.6.29	2020.7.3	2020.7.7	2020.7.10	2020.7.12	2020.7.14
Hb (g/L)	78	68	72	77	82	87

DISCUSSION

Gastrointestinal bleeding is a common digestive tract disease. The main clinical manifestations include hematemesis, melena, and bloody stools. The patient had recurrent melena and positive fecal occult blood accompanied by decreased hemoglobin. Repeated observation of the nasopharynx and oral cavity during hospitalization showed no obvious bleeding foci, which ruled out bleeding from those sites. Thus, the diagnosis of gastrointestinal bleeding was clear. After repeated gastroscopy, colonoscopy, CTA and MRA examinations, no bleeding foci were found, but capsule endoscopy suggested multiple intestinal ulcers. Hence, bleeding caused by multiple intestinal ulcers was considered.

The common causes of multiple intestinal ulcer disease include Bechet’s disease, Crohn’s disease, tuberculosis, cryptogenic multifocal ulcerative stenosis of the small intestine, lymphoma, and drug-induced lesions. There are also many rare diseases that can lead to intestinal ulceration[4-8]. No oral or perineal ulcers were found in this patient, but an ulcer of Bechet’s disease was isolated. It was round, deep, and large, with a clear boundary. The patient also had no history of tuberculosis, cough, or sputum. No obvious abnormalities were found in the PPD, tuberculosis antibody, and tuberculosis T-cell tests. The endoscopic manifestations of Crohn’s disease are longitudinal fissure-like ulcers, paving stone changes, discontinuous lesions, and the mucosa between lesions may be completely normal. This was seen in cryptic multifocal ulcerative stenosis of the small intestine. No lymphoma was detected by endoscopic pathological examination of the terminal ileum and full-abdominal CT, and no lymphoma was detected by capsule endoscopy. The patient had no history of long-term use of drugs that could cause multiple intestinal ulcers. In addition, bone marrow puncture indicated hyperplastic anemia that was consistent with the manifestations of gastrointestinal bleeding, which could then be identified as bleeding without a hematologic causing bleeding. Therefore, the gastrointestinal bleeding of this patient was considered to be caused by other diseases.

Syphilis is a sexually transmitted disease. Early syphilis is usually cured in 4-6 wk. Late syphilis leads to systemic organ damage, such as aortitis, meningitis and uveitis[1]. There are also many reports of patients with cardiovascular syphilis needing mitral valve and tricuspid valve surgery[9-11]. In recent years, some rare cases of syphilis infection with formation of colorectal inflammatory masses that caused gastrointestinal bleeding[2], and cranial nerve infection that caused neurological disease[12] have been reported. There have been cases associated with hepatitis, sclerosing cholangitis, pancreatitis, unilateral nipple bleeding, papillary edema, venous congestion, obstruction, intracranial hemorrhage, cerebral infarction, and other systemic diseases[13-17]. This patient was diagnosed with syphilis in 2008 and failed to receive treatment many times. In 2010, the patient underwent mitral valve replacement and tricuspid valvuloplasty for valve disease and suffered from atrial fibrillation and chronic pancreatitis. The disease development is persistent, with the possibility that syphilis may lead to systemic multisystem disease. Capsule endoscopy indicated small intestine ulcers, and the patient’s hemoglobin was once reduced to 68 g/L. Benzathine penicillin and thrombin treatment were administered jointly to treat syphilis. Blood transfusion was not needed, and the hemoglobin gradually increased to 87 g/L. At 6 mo, the hemoglobin had increased to about 120 g/L, further verifying that the syphilis treatment was effective for the cessation of gastrointestinal bleeding. The reason why many previous treatments for syphilis were not successful was most likely because the treatment was limited to the patient and the sexual partner was ignored, leading to treatment failure.

CONCLUSION

This case report found that syphilis can mimic systemic disease and cause intestinal bleeding. In addition, the treatment of the disease requires both sexual partners to be treated. Finally, although syphilis is easy to treat, it is more important to consider whether bleeding might be caused by syphilis.