# A pictorial essay on cross-sectional imaging findings of pathologies in the second (D2) segment of the duodenum in adults

## TL;DR

This paper reviews imaging findings of diseases in the second part of the duodenum, focusing on how cross-sectional imaging helps identify various pathologies.

## Contribution

The paper offers a detailed pictorial essay on D2 segment pathologies, emphasizing imaging characteristics for accurate diagnosis.

## Key findings

- The D2 segment of the duodenum is prone to multiple pathologies due to its anatomical location.
- Cross-sectional imaging is crucial for diagnosing D2 segment diseases.
- The paper outlines imaging features of congenital, inflammatory, and neoplastic conditions in this region.

## Abstract

The duodenum, the initial segment of the small intestine, is divided into four parts: the superior (D1), descending (second) (D2), horizontal (D3), and ascending (D4) segments. Despite its short length, the descending part (D2 segment) holds clinical significance due to its anatomical proximity to structures such as the gallbladder, right kidney, colon, and pancreas. This anatomical localization and contiguity give rise to various pathologies, including congenital, inflammatory, infectious, neoplastic, vascular, and traumatic conditions. Cross-sectional imaging modalities play a pivotal role in evaluating pathologies of the second (D2) segment of the duodenum. This article aims to provide a comprehensive overview of these pathologies and delineate their imaging characteristics.