Natural killer cell enteropathy, also termed  NK cell enteropathy (NKCE), and a closely related disorder, lymphomatoid gastropathy (LG), are non-malignant diseases in which one type of lymphocyte, the natural killer cell (i.e. NK cell), proliferates excessively in  the gastrointestinal tract (GI tract). This proliferation causes red, sore-like spots, raised lesions, erosions, and ulcers in the mucosal layer surrounding the GI tract lumen. Both disorders cause either no or only vague symptoms of GI tract disturbances such as nausea, vomiting, and bleeding.In 2006, a persistent but apparently benign disease that involved the proliferation of NK cells at multiple sites throughout the intestines was described. This disorder appeared similar to and easily mistaken for a highly malignant disease, extranodal NK/T-cell lymphoma, nasal type. In 2010, a similarly non-malignant disorder that involved the proliferation of NK cells in the stomach was described. The disease mimicked gastrointestinal lymphomas. Since these first descriptions, several case series and case reports have been published on these enteropathies.The two NK cell proliferation diseases have been termed NK cell enteropathy and lymphomatoid gastropathy with NKCE being seen mostly in the United States and Korea and LG being seen mostly in Japan. Besides this geographical difference, the only other critical difference between the two diseases is that the lesions in NKCE occur in the small intestine, colon, stomach, and/or esophagus while those of LG are limited to the stomach.
Director Alfred Hitchcock heard about this invasion while working on his adaptation of the Daphne du Maurier novelette "The Birds" for his feature film The Birds (1963), and asked the Santa Cruz Sentinel for any further news copy as "research for his new thriller." See also
Diarrhetic shellfish poisoning (DSP)
Neurotoxic shellfish poisoning (NSP)
Paralytic shellfish poisoning (PSP)
Harmful algal blooms (HABs)

References
External links
Amnesic Shellfish Poisoning at Woods Hole Oceanographic Institution
Domoic acid and Pseudo-nitzschia references at Fisheries and Oceans Canada
Amnesic Shellfish Poisoning, Domoic Acid, and Pseudo-nitzschia links at the ISSHA website
Domoic acid at International Programme on Chemical Safety
DOMOIC ACID — A MAJOR CONCERN TO WASHINGTON STATE’S SHELLFISH LOVERS at Washington Department of Fish and Wildlife
Crisis off our coast at the International Bird Rescue Research Center
Domoic Acid Poisoning Linked to Recent Marine Strandings and Deaths at Heal the Bay
Domoic Acid Information and History at the Channel Islands Marine and Wildlife Institute