What is DIPNECH?
Diffuse Idiopathic Pulmonary Neuroendocrine Cell Hyperplasia, commonly known as DIPNECH, is a rare lung condition characterised by abnormal overgrowth of neuroendocrine cells within the airways. It is considered a pre-malignant or early neoplastic condition that can progress to neuroendocrine tumours (NETs) of the lung.
It primarily affects middle-aged women who are non-smokers. The condition involves widespread small nodules in the lungs caused by proliferation of neuroendocrine cells.
Over time, some of these lesions may develop into carcinoid tumours, which are a type of lung neuroendocrine tumour.
Incidence
DIPNECH is rare and likely underdiagnosed because its symptoms mimic asthma. It is more commonly reported in women and usually identified in middle age.
Symptoms
Patients typically present with chronic cough and shortness of breath. Wheezing is common and may not respond well to asthma treatment.
Because the condition progresses slowly, symptoms may persist for years before correct diagnosis. In cases where neuroendocrine tumours develop, additional lung nodules may appear on imaging.
Diagnosis
High-resolution CT scan of the chest often shows multiple small lung nodules and air trapping. Pulmonary function tests may show obstructive patterns.
Definitive diagnosis requires lung biopsy. Microscopic examination shows diffuse proliferation of neuroendocrine cells in the bronchial walls. If tumourlets or carcinoid tumours are present, they are identified during histological analysis.
Treatment
Management depends on severity. In mild cases, monitoring and symptom control may be sufficient. Bronchodilators and inhaled steroids are sometimes used for symptom relief.
If neuroendocrine tumours develop, surgical removal of localised tumours may be performed. In progressive cases, somatostatin analogues may help control symptoms and tumour growth.
Prognosis
DIPNECH generally progresses slowly. Many patients live for years with stable disease. However, in some individuals, progression to carcinoid tumours can occur. Regular imaging and follow-up are important to detect progression early.
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