Hypothalamic germinoma masquerading as superior mesenteric artery (SMA) syndrome

Area of Science:

• Endocrinology
• Gastroenterology
• Neuro-oncology

Background:

• Superior mesenteric artery (SMA) syndrome is typically associated with weight loss from conditions like diabetes or thyrotoxicosis.
• This case explores an unusual etiology of SMA syndrome linked to hypothalamic/pituitary dysfunction.

Observation:

• An adolescent presented with SMA syndrome, characterized by duodenal obstruction and a narrow aortomesenteric angle.
• Investigations revealed pan-hypopituitarism and a hypothalamic germinoma on MRI.
• Hormone replacement therapy improved weight and gastrointestinal symptoms.

Findings:

• A hypothalamic germinoma was confirmed via biopsy.
• SMA syndrome resolved with treatment of the underlying endocrine disorder and hormone replacement.
• This presentation highlights endocrine cachexia as a cause of SMA syndrome.

Implications:

• Recognizing SMA syndrome secondary to hypothalamic disease can prevent misdiagnosis and unnecessary surgical intervention.
• This case expands the differential diagnosis for SMA syndrome, emphasizing the importance of thorough endocrine evaluation.
• Early identification and management of the underlying cause are crucial for favorable outcomes.