# Hydatid Cyst Masquerading as Chronic Sialadenitis-an Extremely Rare Locale of Zoonotic Disease Demystified by Cytology

## TL;DR

A rare case of hydatid cyst mistaken for chronic sialadenitis is diagnosed using cytology, highlighting a unique presentation of a zoonotic disease.

## Contribution

This paper reports the first documented case of hydatid cyst presenting as chronic sialadenitis and demonstrates the safe use of cytology for diagnosis.

## Key findings

- Hydatid cyst was diagnosed in an extremely rare location, mimicking chronic sialadenitis.
- Cytology was safely used to detect refractile hooklets, confirming hydatid disease.
- Serological and histopathological findings confirmed the initial cytological diagnosis.

## Abstract

Hydatid cyst disguised as chronic sialadenitis, represents a highly unusual clinical presentation. Only rarely do hydatid embryos escape the hepatic and pulmonary vasculature to enter other organ territories. This report highlights a tropical infection hoodwinking clinical suspicion due to an unexpected rare anatomical site of appearance. The present case masqueraded as a comparatively innocuous chronic sialadenitis. In addition, previous work has debated the use of cytology in diagnosing hydatid cyst on the grounds of triggering anaphylaxis.If done carefully, however, rewarding diagnostic returns can be seen, as seen herein.

We present an extremely rare case of a 35- year -old female presenting with swelling in the submandibular region with pain for two months. Ultrasonography revealed a hypoechoic lesion with fine needle aspiration showing the presence of numerous refractile hooklets suggesting hydatid disease. The same was confirmed both by serological evaluation and subsequent histopathological findings.

This report highlights a unique presentation of hydatid cyst presenting as chronic sialadenitis, hitherto unreported in medical literature. Furthermore, it documents a safe diagnostic course employing cytology to diagnose atypical echinococcal infections.