Primary soft tissue hydatidosis: Aspiration cytological diagnosis in two cases

Abstract

The most common sites of cysts caused by hydatid disease are liver and lung. In the absence of visceral involvement, the disease rarely affects musculoskeletal and soft tissues. In such locations, hydatid cyst mimics commoner soft tissue tumors. A 12-year-old girl presented with a gradually increasing painless right shoulder swelling. With a clinical diagnosis of lipoma, fine needle aspiration cytology was performed, which showed cytomorphological features of a hydatid cyst. Another patient, a 20-year-old man, presented with a right paravertebral soft tissue swelling. Radiological investigations did not reveal any bony abnormality or features of intervertebral disc prolapse and thus, a clinical diagnosis of a paravertebral soft tissue tumor was considered. Fine needle aspiration from the soft tissue swelling showed laminated membrane, compatible with hydatid cyst. No visceral involvement was detected in either of the cases. Parasitic cysts, although rare, should be kept in the list of cytological differential diagnosis of soft tissue lesions. Occurrence of hydatid cyst in a soft tissue location is extremely rare. Aspiration cytology can be used efficiently in the diagnosis without the risk of spillage of contents.

Fine Needle Aspiration Cytology of Hepatic Hydatid Cyst: A Case Study

“…In some cases, only laminated membranes were present in the inflammatory background 10-12. In the current case, protoscolices, hooklets, and laminated membranes were identified and the background showed necrotic debris and inflammatory cells.…”

“…FNAC appears to be a safe and useful method in the diagnosis of hydatid cyst, although arguments regarding this issue persist 13. Cytologic diagnosis of hydatid cysts has been reported in the lung,14 omentum,15 muscle,16 soft tissue,10,12 brain,17 orbit,18 and joints 11…”

Hydatid Cystic Disease of Lumbar Paraspinal Muscles

“…Biochemical blood tests uses complement fixation and ELISA helps in diagnosis [14][15]. In our case the Casoni serological test was positive.…”

Role of fine needle aspiration biopsy cytology in the diagnosis of infections

“…In other cases there will be a thin proteinaceous fluid background in which scattered scolices with refractile hooklets, single birefringent hooklets, and sometimes fragments of laminated cyst wall will be seen. 1,[49][50][51] (Fig. 10).…”