Diagnostic Dilemma: Unraveling the Cause of Anemia in a 35-Year-Old Female

QUESTION

A 35-year-old female with past medical history of small bowel obstruction requiring small bowel resection five years prior presents to the emergency department with nonspecific complaints including fatigue, anorexia, and difficulty balancing. Physical exam is significant for glossitis and pallor. Complete blood count (CBC) demonstrates a hemoglobin 6 g/dL, hematocrit 17%, and mean corpuscular volume of 140 fL/erythrocyte. Which of the following diagnoses is most likely? Acute blood loss anemia Folate deficiency Pernicious anemia Vertigo

ANSWER

Diagnostic Dilemma: Unraveling the Cause of Anemia in a 35-Year-Old Female

Introduction

A 35-year-old female presenting with fatigue, anorexia, difficulty balancing, glossitis, and pallor raises concerns about an underlying medical condition, particularly anemia. The diagnostic process must consider multiple factors to determine the most likely diagnosis. In this essay, we will explore the differential diagnoses and ultimately identify the condition most likely responsible for the patient’s symptoms.

Differential Diagnoses

1. Acute Blood Loss Anemia
Rationale: Acute blood loss anemia can result from sudden hemorrhage, leading to a rapid drop in hemoglobin levels and clinical symptoms such as fatigue.
Considerations: The patient’s past medical history of small bowel resection five years prior may predispose her to gastrointestinal bleeding. However, the presentation of glossitis and pallor suggests a chronic condition rather than acute blood loss.

2. Folate Deficiency
Rationale: Folate deficiency can lead to anemia, causing fatigue, glossitis, and anorexia.
Considerations: While folate deficiency is plausible, it often presents with a mean corpuscular volume (MCV) within the reference range. The elevated MCV of 140 fL/erythrocyte suggests a macrocytic anemia, which is not typically associated with folate deficiency.

3. Pernicious Anemia:
Rationale: Pernicious anemia, typically caused by vitamin B12 deficiency, can lead to macrocytic anemia and neurological symptoms such as difficulty balancing.
Considerations: The patient’s glossitis and elevated MCV align with macrocytic anemia. Pernicious anemia due to vitamin B12 deficiency is a strong possibility.

4. Vertigo
Rationale: Vertigo is characterized by dizziness or a spinning sensation and can be a symptom of various underlying conditions.
Considerations: While vertigo can co-occur with anemia, it is not a standalone diagnosis but rather a symptom that may be associated with the underlying cause of anemia.

Most Likely Diagnosis

Given the patient’s presentation of glossitis, pallor, macrocytic anemia (elevated MCV), and neurological symptoms such as difficulty balancing, the most likely diagnosis among the options provided is Pernicious Anemia.

Rationale for Pernicious Anemia

Pernicious anemia is an autoimmune condition characterized by the inability to absorb vitamin B12, often due to the lack of intrinsic factor produced by the stomach. This deficiency leads to macrocytic anemia and neurological symptoms. Glossitis and anorexia can also be associated with B12 deficiency.

Conclusion

While the differential diagnoses considered various possibilities, the clinical presentation, including glossitis, macrocytic anemia with an elevated MCV, and neurological symptoms, strongly points to pernicious anemia as the most likely diagnosis in this 35-year-old female. Further diagnostic tests, such as measurement of vitamin B12 levels and intrinsic factor antibodies, should be performed to confirm the diagnosis and initiate appropriate treatment.