Table 5.

Surgical management of the pseudotumor: cases (C) listed by location of the ARMD. Site: A periarticular, B intrapelvic retroperitoneal, C mainly circumscribed inside the femur. An accurate debridement of the reactive and necrotic tissue, associated with fluid drainage when a cystic cavity was present, was performed in all cases.

ARMD site	C	ARMD type	Perioperative and intraoperative notes
A	1	Solid + Cystic
A	2	Solid
A	5	Solid + Cystic
A	6	Solid + Cystic	Aggressive granulomatosis, spontaneous greater trochanter fracture associated with apparent acute loosening of the stem (asymptomatic patient before fracture)
A	7	Solid + Cystic
A	9	Cystic	Ultrasound guided percutaneous drainage from a relapsing aseptic fluid collection (3 months before revision surgery); widespread fibrosis and muscle-fascial scar adhesion.
A	14	Solid + Cystic
A + B	3	Solid + Cystic	Retroperitoneal intrapelvic fluid collection spontaneously drained from acetabular bone defects
A + B	11	Solid + Cystic	Retroperitoneal intrapelvic fluid collection spontaneously drained from acetabular bone defects
A + B	15	Solid + Cystic	Severe degeneration and necrosis of abductors tendons; ilioinguinal approach to manage large retroperitoneal intrapelvic semi-cystic pseudotumor adherent to the left iliac vessels.
B	8	Solid + Cystic	Misleading clinical manifestations of abdominal pain; diagnostic ultrasound guided percutaneous drainage from an intrapelvic semi-cystic pseudotumor (ALVAL); ilioinguinal approach to manage the semi-cystic pseudotumor at time of partial THA revision.
B	12	Cystic	Retroperitoneal intrapelvic fluid collection spontaneously drained from acetabular bone defects
B	13	Solid + Cystic	Repeated ultrasound guided percutaneous drainage from an intrapelvic relapsing aseptic fluid collection before THA revision (being the correlation with ARMD unrecognized initially); ilioinguinal approach to manage the semi-cystic pseudotumor at time of THA revision.
C	4	(Solid)
C	10	(Solid)