Hypertrophic osteoarthropathy masquerading as lower extremity cellulitis and response to bisphosphonates.

Hypertrophic osteoarthropathy (HOA) is characterized by clubbing of digits and, in more advanced stages, by periosteal new bone formation and synovial effusions. Secondary HOA typically occurs in the setting of intrathoracic malignancy, infections or lung metastases. We report a case with an atypical presentation of HOA. The prominent systemic signs, presentation limited to lower extremities only and an excellent response to bisphosphonates make this case unusual.