Internal herniation of the abdominal wall.

A symptomatic arcuate line hernia should be considered in patients with acute lower abdominal complaints. This rare internal herniation is caused by a sharp ending of the posterior aponeurotic sheath of the rectus muscle, rather than the more common gradual delineation, and can cause strangulation or incarceration of abdominal contents.

Normocalcemia but still elevated parathyroid hormone levels after parathyroidectomy.

Even when laboratory results at first match with clinical assessment, assay interference should still be on a clinician's mind when later results no longer fit with the patient.