**Question:** Linitis plastica is commonly seen in -

A. Gastric adenocarcinoma
B. Esophageal adenocarcinoma
C. Lymphoma
D. Gastrointestinal stromal tumors (GISTs)

**Core Concept:** Linitis plastica is a term that describes a diffuse infiltrative process affecting the gastrointestinal tract, particularly the stomach and small intestine. It is characterized by extensive tumor infiltration leading to the destruction of the muscularis propria, resulting in a "plastic" appearance on endoscopy.

**Why the Correct Answer is Right:** Linitis plastica is primarily associated with gastric adenocarcinoma, which is a malignant tumor originating from the glandular epithelium of the stomach. In this condition, the diffuse infiltration of the tumor extends beyond the serosal surface and involves both the muscular and submucosal layers, leading to the characteristic endoscopic appearance.

**Why Each Wrong Option is Incorrect:**

A. Esophageal adenocarcinoma is less commonly associated with linitis plastica, as it primarily involves the esophagus and has distinct endoscopic and histopathological features.
B. Esophageal adenocarcinoma is not the primary cause of linitis plastica, as mentioned above.
C. Although lymphomas can infiltrate the gastrointestinal tract, they generally present as solitary masses rather than diffuse infiltration, making them less likely to cause linitis plastica.
D. Gastrointestinal stromal tumors (GISTs) are spindle cell tumors arising from the interstitial cells of Cajal and are typically localized. They rarely present with linitis plastica.

**Clinical Pearl:** Linitis plastica can be a diagnostic challenge, as it shares some clinical and endoscopic features with other gastrointestinal malignancies. A thorough clinical history, physical examination, and investigations are essential in making a definitive diagnosis.

**Correct Answer:** A. Gastric adenocarcinoma

Linitis plastica is primarily associated with gastric adenocarcinoma due to its characteristic diffuse infiltration, which results in the destruction of the muscularis propria and submucosa, leading to the "plastic" appearance on endoscopy. This clinical entity is important to recognize as it can guide treatment and prognosis decisions in patients with suspected gastrointestinal malignancies.