Abstract:Hydatid cyst is not an uncommon disease, primarily affecting the liver, lungs and other viscera. In case of disseminated disease, cysts may be found in uncommon locations like muscle and subcutaneous tissue. However, the presence of a hydatid cyst in subcutaneous tissue only, without being present in liver or lungs is an extremely rare entity. Here we report such a rare case of solitary primary subcutaneous hydatid cyst, misdiagnosed previously as a cold abscess until aspiration clinched the diagnosis.A 46 year old female patient presented with a gradually progressive swelling in the right supraclavicular region. Imaging studies favoured a cold abscess. Haematoxylin and Eosin stained aspirated fluid from the swelling showed the presence of scolices with hooklets. This finding conclusively proved the swelling to be a hydatid cyst. Serological tests were negative. No other organ involvement was found. The case was finally diagnosed to be an extremely rare case of primary solitary subcutaneous hydatid cyst in the supraclavicular region. The cyst was surgically removed.This case points to the fact that although hydatid cyst is a rare possibility, it should be considered in the differential diagnosis of any cystic lesion. Without the correct diagnosis, proper therapy can be missed and might lead to recurrence of the disease.