ACE and lymphoma: To evaluate the patient for infiltrative disease, i.e., lymphoma, sarcoidosis, and tuberculosis, we tested serum lactate dehydrogenase (LDH) and angiotensin-converting enzyme (ACE) levels, which were reported in the normal range (LDH: 353 (230–460 U/L) and ACE: 51.1(8–52 U/L)).