Myeloid sarcoma of appendix mimicking acute appendicitis.

Context: Myeloid sarcoma is a neoplasm of immature myeloid cells involving an extramedullary anatomic site that is usually, although not always, associated with acute myeloid leukemia. Any extramedullary site can be involved by myeloid sarcoma, but involvement of the cecal appendix is uncommon, and symptoms mimicking acute appendicitis as a result of appendiceal involvement are rare.

Objective: To describe the clinicopathologic features of 2 patients with myeloid sarcoma involving the appendix who presented with right lower quadrant pain suggestive of acute appendicitis and prompting appendectomy.

Hodgkin lymphoma involving Waldeyer ring: a clinicopathologic study of 22 cases.

We report 22 cases of Hodgkin lymphoma involving Waldeyer ring seen at our institution during a 31-year interval. There were 16 males (73%) and 6 females (27%) with a median age of 48 years (range, 5-81 years), and 15 (68%) patients had airway obstruction or tonsillar enlargement. For 19 patients, the clinical stage was as follows: I, 7 (32%); II, 11 (50%); and III, 1 (5%).