Necrotizing Panniculitis as an Uncommon Manifestation of Acute Pancreatitis

Pancreatic panniculitis is a rare disorder affecting 2-3% of patients with pancreatic disease. The findings are characterized by tender, erythematous, subcutaneous nodules which may undergo spontaneous ulceration with discharge of brownish and viscous material derived from colliquative necrosis of adipocytes. The lesions are usually localized in the lower limbs, although they may also extend to the buttocks and also involve the trunk, upper limbs and scalp. They can precede overt pancreatic disease in 40% of cases. The typical histological features observed in these lesions are characterized by necrotic adipocytes with absent nuclei (better known as 'ghost cells') in the context of a predominantly lobular panniculitis. We describe the case of a 78-year-old cirrhotic woman admitted to our department with abdominal pain affecting the upper abdomen and a 3-day fever. On physical examination, multiple tender erythematous nodules, with irregular margins, were present on the pretibial regions of both lower legs, ranging in size from 0.8 to 1.5 cm. Pancreatic amylase and lipase were elevated and abdominal computed tomography revealed acute pancreatitis with oedema, focal gland enlargement of the pancreatic tail and perivisceral inflammation. Histological examination of the lesions was consistent with a diagnosis of necrotizing granulomatous panniculitis. Identification of the aetiological factors of tender erythematous nodules is challenging.Careful examination and history taking is essential for correct diagnosis and proper treatment.Pancreatic panniculitis should be included in the differential diagnosis as it can indicate developing acute pancreatitis.