Diagnosis
In many cases, gastrinoma is diagnosed based on the patients history which is typically characterized by recurrent episodes of peptic ulcer disease or by severe reflux esophagitis and/or diarrhea or by acid-related symptoms which fail to respond to standard treatment regimens. To confirm the diagnosis of gastrinoma a series of blood tests must be made. One of those tests is the serum gastrin level, which is the most reliable test for patients with gastrinoma. The normal levels of gastrin are 150 pg/mL ( > 72.15 pmol/L); therefore elevated levels of > 1000 pg/mL (> 480 pmol/L) would establish the diagnosis of gastrinoma. Another test that can be conducted is the secretin stimulated test, which is useful in patients who have the sign and symptoms of gastrinoma but the gastrin levels are below < 1000 pg/mL. Usually, an Intravenous bolus consisting of secretin 2mcg/kg and is measured in 10 minute intervals up to 30 minutes total. Secretin, which is a hormone released from the duodenal S cells that induce the release of pancreatic bicarbonate (HCO3) that would neutralize the acidic environment due to high gastrin levels. Therefore, if the patients level of gastrin remains consistently high indicating gastrin release due to tumor such as gastrinoma.Other commonly used tests to further confirm the diagnosis are

CT scan of the abdominal area
Somatostatin receptor scintigraphy which is used to identify the location of the tumor
PET scan
Endoscopic ultrasound if there are no signs of tumor metastases. Treatment
Surgery is first line treatment in gastrinomas; however it often fails to be curative.
Eruptive vellus hair cysts (or EVHC) are small lesions that occur most often in the chest wall, abdomen and extremities, often with a crusted surface. : 680  EVHC may occur randomly, or it can be inherited as an autosomal dominant trait. The condition affects males and females equally, and sporadic cases usually appear at 4–18 years of age. The cysts appear similar clinically to steatocystoma multiplex, as well as acneiform eruptions and milia. Therapeutic techniques that are safe and effective are rare, with incision and drainage being the primary form of treatment when sporadic regression does not occur. It was first described in 1977. Signs/symptoms
Cause
Diagnosis
Histopathology is the basis of diagnosis. Stratified-squamous epithelium with a granular layer that surrounding a cystic space filled with laminated keratin and a variable number of vellus hair cysts is seen to be present. It can be difficult to distinguish from other skin conditions, including molluscum contagiosum and acne vulgaris but can be corroborated with histopathology. Associations
It can be associated with Steatocystoma multiplex. Treatment
The primary indication for treatment is cosmesis. Retinoids, surgery, and lasers are used as treatment modalities. See also
Steatocystoma simplex
Milia
List of cutaneous conditions

References
Further reading
Torchia, Daniele; Vega, Janelle; Schachner, Lawrence A. (1 February 2012). "Eruptive Vellus Hair Cysts". American Journal of Clinical Dermatology. 13 (1): 19–28. doi:10.2165/11589050-000000000-00000. PMID 21958358.