RESUMEN
Insulinoma is a rare neuroendocrine functional tumor of the pancreas of unknown etiology which manifests itself through hypoglycemic symptoms which resolve by administering glycose. Common autonomic symptoms of insulinoma include diaphroresis, tremor, and palpitations, whereas neuroglycopenenic symptoms include confusion, behavioural changes, personality changes, visual disturbances, seizure, and coma. In most cases, these are benign solitary tumors of the pancreas, and in 5% of the cases they are associated with MEN1 syndrome. A characteristic of the diagnosis is the presence of hypoglycemia, and increased levels of C-peptide and insulin. Further radiological verification (non-invasive imaging procedures: computed tomography and magnetic resonance imaging; and invasive modalities, such as endoscopic ultrasonography and arterial stimulation venous sampling) of the tumor are required as well as its surgical extraction. We present a case of a middle-aged male with history of recurrent hypoglycemic episodes with vertigo, sweating, tremors, anxiety, fatigue, and loss of consciousness, all of which resolved after eating food. The diagnoses were confirmed after we performed non-invasive imaging procedure, such as Computed Tomography and Magnetic Resonance Imaging. The patient underwent successful resection of the tumor, and his symptoms showed complete resolution. Despite the low incidence of these tumors, they should be suspected, in cases where the patient presents with repetitive hypoglycemic episodes, with symptoms, which resolve after eating a meal. Timely diagnosis and adequate treatment in most cases equals to complete withdrawal of symptoms.